From fd8f3dce3bd9382e7c3b208c18d98f078134b67d Mon Sep 17 00:00:00 2001
From: Carlos Granados <barel.barelon@gmail.com>
Date: Fri, 16 Jan 2026 17:28:49 +0100
Subject: [PATCH] Add functions that work with suffixes and prefixes

---
 Zend/Optimizer/zend_func_infos.h              |   6 +
 ext/standard/basic_functions.stub.php         |  36 ++++
 ext/standard/basic_functions_arginfo.h        |  40 ++++-
 ext/standard/string.c                         | 160 ++++++++++++++++++
 .../tests/strings/str_prefix_ensure.phpt      |  64 +++++++
 .../tests/strings/str_prefix_remove.phpt      |  64 +++++++
 .../tests/strings/str_prefix_replace.phpt     |  66 ++++++++
 .../tests/strings/str_suffix_ensure.phpt      |  64 +++++++
 .../tests/strings/str_suffix_remove.phpt      |  64 +++++++
 .../tests/strings/str_suffix_replace.phpt     |  66 ++++++++
 10 files changed, 629 insertions(+), 1 deletion(-)
 create mode 100644 ext/standard/tests/strings/str_prefix_ensure.phpt
 create mode 100644 ext/standard/tests/strings/str_prefix_remove.phpt
 create mode 100644 ext/standard/tests/strings/str_prefix_replace.phpt
 create mode 100644 ext/standard/tests/strings/str_suffix_ensure.phpt
 create mode 100644 ext/standard/tests/strings/str_suffix_remove.phpt
 create mode 100644 ext/standard/tests/strings/str_suffix_replace.phpt

diff --git a/Zend/Optimizer/zend_func_infos.h b/Zend/Optimizer/zend_func_infos.h
index b7b118c710c53..89d435a1a6328 100644
--- a/Zend/Optimizer/zend_func_infos.h
+++ b/Zend/Optimizer/zend_func_infos.h
@@ -481,6 +481,12 @@ static const func_info_t func_infos[] = {
 	F1("stristr", MAY_BE_STRING|MAY_BE_FALSE),
 	F1("strstr", MAY_BE_STRING|MAY_BE_FALSE),
 	F1("strrchr", MAY_BE_STRING|MAY_BE_FALSE),
+	F1("str_prefix_ensure", MAY_BE_STRING),
+	F1("str_prefix_remove", MAY_BE_STRING),
+	F1("str_prefix_replace", MAY_BE_STRING),
+	F1("str_suffix_ensure", MAY_BE_STRING),
+	F1("str_suffix_remove", MAY_BE_STRING),
+	F1("str_suffix_replace", MAY_BE_STRING),
 	F1("chunk_split", MAY_BE_STRING),
 	FN("substr_replace", MAY_BE_STRING|MAY_BE_ARRAY|MAY_BE_ARRAY_KEY_LONG|MAY_BE_ARRAY_KEY_STRING|MAY_BE_ARRAY_OF_STRING),
 	F1("quotemeta", MAY_BE_STRING),
diff --git a/ext/standard/basic_functions.stub.php b/ext/standard/basic_functions.stub.php
index e27dca069c55b..dbe4f78ad6798 100644
--- a/ext/standard/basic_functions.stub.php
+++ b/ext/standard/basic_functions.stub.php
@@ -2429,6 +2429,42 @@ function str_starts_with(string $haystack, string $needle): bool {}
 /** @compile-time-eval */
 function str_ends_with(string $haystack, string $needle): bool {}
 
+/**
+ * @compile-time-eval
+ * @refcount 1
+ */
+function str_prefix_ensure(string $prefix, string $subject): string {}
+
+/**
+ * @compile-time-eval
+ * @refcount 1
+ */
+function str_prefix_remove(string $prefix, string $subject): string {}
+
+/**
+ * @compile-time-eval
+ * @refcount 1
+ */
+function str_prefix_replace(string $prefix, string $replace, string $subject): string {}
+
+/**
+ * @compile-time-eval
+ * @refcount 1
+ */
+function str_suffix_ensure(string $suffix, string $subject): string {}
+
+/**
+ * @compile-time-eval
+ * @refcount 1
+ */
+function str_suffix_remove(string $suffix, string $subject): string {}
+
+/**
+ * @compile-time-eval
+ * @refcount 1
+ */
+function str_suffix_replace(string $suffix, string $replace, string $subject): string {}
+
 /**
  * @compile-time-eval
  * @refcount 1
diff --git a/ext/standard/basic_functions_arginfo.h b/ext/standard/basic_functions_arginfo.h
index 6f202c01463fd..969f8ec2312e7 100644
--- a/ext/standard/basic_functions_arginfo.h
+++ b/ext/standard/basic_functions_arginfo.h
@@ -1,5 +1,5 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: 1a1667a5c59111f096a758d5bb4aa7cf3ec09cfe */
+ * Stub hash: ed8b640a6ea3d5fcb1a3c571bfe98c794e6448b4 */
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_set_time_limit, 0, 1, _IS_BOOL, 0)
 	ZEND_ARG_TYPE_INFO(0, seconds, IS_LONG, 0)
@@ -928,6 +928,32 @@ ZEND_END_ARG_INFO()
 
 #define arginfo_str_ends_with arginfo_str_contains
 
+ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_str_prefix_ensure, 0, 2, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO(0, prefix, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO(0, subject, IS_STRING, 0)
+ZEND_END_ARG_INFO()
+
+#define arginfo_str_prefix_remove arginfo_str_prefix_ensure
+
+ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_str_prefix_replace, 0, 3, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO(0, prefix, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO(0, replace, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO(0, subject, IS_STRING, 0)
+ZEND_END_ARG_INFO()
+
+ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_str_suffix_ensure, 0, 2, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO(0, suffix, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO(0, subject, IS_STRING, 0)
+ZEND_END_ARG_INFO()
+
+#define arginfo_str_suffix_remove arginfo_str_suffix_ensure
+
+ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_str_suffix_replace, 0, 3, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO(0, suffix, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO(0, replace, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO(0, subject, IS_STRING, 0)
+ZEND_END_ARG_INFO()
+
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_chunk_split, 0, 1, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO(0, string, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, length, IS_LONG, 0, "76")
@@ -2560,6 +2586,12 @@ ZEND_FUNCTION(strrchr);
 ZEND_FUNCTION(str_contains);
 ZEND_FUNCTION(str_starts_with);
 ZEND_FUNCTION(str_ends_with);
+ZEND_FUNCTION(str_prefix_ensure);
+ZEND_FUNCTION(str_prefix_remove);
+ZEND_FUNCTION(str_prefix_replace);
+ZEND_FUNCTION(str_suffix_ensure);
+ZEND_FUNCTION(str_suffix_remove);
+ZEND_FUNCTION(str_suffix_replace);
 ZEND_FUNCTION(chunk_split);
 ZEND_FUNCTION(substr);
 ZEND_FUNCTION(substr_replace);
@@ -3162,6 +3194,12 @@ static const zend_function_entry ext_functions[] = {
 	ZEND_RAW_FENTRY("str_contains", zif_str_contains, arginfo_str_contains, ZEND_ACC_COMPILE_TIME_EVAL, frameless_function_infos_str_contains, NULL)
 	ZEND_RAW_FENTRY("str_starts_with", zif_str_starts_with, arginfo_str_starts_with, ZEND_ACC_COMPILE_TIME_EVAL, frameless_function_infos_str_starts_with, NULL)
 	ZEND_RAW_FENTRY("str_ends_with", zif_str_ends_with, arginfo_str_ends_with, ZEND_ACC_COMPILE_TIME_EVAL, NULL, NULL)
+	ZEND_RAW_FENTRY("str_prefix_ensure", zif_str_prefix_ensure, arginfo_str_prefix_ensure, ZEND_ACC_COMPILE_TIME_EVAL, NULL, NULL)
+	ZEND_RAW_FENTRY("str_prefix_remove", zif_str_prefix_remove, arginfo_str_prefix_remove, ZEND_ACC_COMPILE_TIME_EVAL, NULL, NULL)
+	ZEND_RAW_FENTRY("str_prefix_replace", zif_str_prefix_replace, arginfo_str_prefix_replace, ZEND_ACC_COMPILE_TIME_EVAL, NULL, NULL)
+	ZEND_RAW_FENTRY("str_suffix_ensure", zif_str_suffix_ensure, arginfo_str_suffix_ensure, ZEND_ACC_COMPILE_TIME_EVAL, NULL, NULL)
+	ZEND_RAW_FENTRY("str_suffix_remove", zif_str_suffix_remove, arginfo_str_suffix_remove, ZEND_ACC_COMPILE_TIME_EVAL, NULL, NULL)
+	ZEND_RAW_FENTRY("str_suffix_replace", zif_str_suffix_replace, arginfo_str_suffix_replace, ZEND_ACC_COMPILE_TIME_EVAL, NULL, NULL)
 	ZEND_RAW_FENTRY("chunk_split", zif_chunk_split, arginfo_chunk_split, ZEND_ACC_COMPILE_TIME_EVAL, NULL, NULL)
 	ZEND_RAW_FENTRY("substr", zif_substr, arginfo_substr, ZEND_ACC_COMPILE_TIME_EVAL, frameless_function_infos_substr, NULL)
 	ZEND_RAW_FENTRY("substr_replace", zif_substr_replace, arginfo_substr_replace, ZEND_ACC_COMPILE_TIME_EVAL, NULL, NULL)
diff --git a/ext/standard/string.c b/ext/standard/string.c
index 0b7d5be1a2576..d9c79bdfe22b5 100644
--- a/ext/standard/string.c
+++ b/ext/standard/string.c
@@ -1889,6 +1889,166 @@ PHP_FUNCTION(str_ends_with)
 }
 /* }}} */
 
+/* {{{ Adds prefix to subject string if subject does not already start with prefix */
+PHP_FUNCTION(str_prefix_ensure)
+{
+	zend_string *subject, *prefix;
+
+	ZEND_PARSE_PARAMETERS_START(2, 2)
+		Z_PARAM_STR(prefix)
+		Z_PARAM_STR(subject)
+	ZEND_PARSE_PARAMETERS_END();
+
+	if (ZSTR_LEN(prefix) == 0) {
+		RETURN_STR_COPY(subject);
+	}
+
+	if (ZSTR_LEN(prefix) <= ZSTR_LEN(subject) &&
+		memcmp(ZSTR_VAL(subject), ZSTR_VAL(prefix), ZSTR_LEN(prefix)) == 0) {
+		RETURN_STR_COPY(subject);
+	}
+
+	zend_string *result = zend_string_alloc(ZSTR_LEN(prefix) + ZSTR_LEN(subject), 0);
+	memcpy(ZSTR_VAL(result), ZSTR_VAL(prefix), ZSTR_LEN(prefix));
+	memcpy(ZSTR_VAL(result) + ZSTR_LEN(prefix), ZSTR_VAL(subject), ZSTR_LEN(subject));
+	ZSTR_VAL(result)[ZSTR_LEN(prefix) + ZSTR_LEN(subject)] = '\0';
+	RETURN_NEW_STR(result);
+}
+/* }}} */
+
+/* {{{ Removes prefix from subject string if subject starts with prefix */
+PHP_FUNCTION(str_prefix_remove)
+{
+	zend_string *subject, *prefix;
+
+	ZEND_PARSE_PARAMETERS_START(2, 2)
+		Z_PARAM_STR(prefix)
+		Z_PARAM_STR(subject)
+	ZEND_PARSE_PARAMETERS_END();
+
+	if (ZSTR_LEN(prefix) > ZSTR_LEN(subject)) {
+		RETURN_STR_COPY(subject);
+	}
+
+	if (memcmp(ZSTR_VAL(subject), ZSTR_VAL(prefix), ZSTR_LEN(prefix)) == 0) {
+		RETURN_STRINGL(ZSTR_VAL(subject) + ZSTR_LEN(prefix), ZSTR_LEN(subject) - ZSTR_LEN(prefix));
+	}
+
+	RETURN_STR_COPY(subject);
+}
+/* }}} */
+
+/* {{{ Replaces prefix in subject string if subject starts with prefix */
+PHP_FUNCTION(str_prefix_replace)
+{
+	zend_string *subject, *prefix, *replace;
+
+	ZEND_PARSE_PARAMETERS_START(3, 3)
+		Z_PARAM_STR(prefix)
+		Z_PARAM_STR(replace)
+		Z_PARAM_STR(subject)
+	ZEND_PARSE_PARAMETERS_END();
+
+	if (ZSTR_LEN(prefix) > ZSTR_LEN(subject)) {
+		RETURN_STR_COPY(subject);
+	}
+
+	if (memcmp(ZSTR_VAL(subject), ZSTR_VAL(prefix), ZSTR_LEN(prefix)) == 0) {
+		size_t remaining_len = ZSTR_LEN(subject) - ZSTR_LEN(prefix);
+		zend_string *result = zend_string_alloc(ZSTR_LEN(replace) + remaining_len, 0);
+		memcpy(ZSTR_VAL(result), ZSTR_VAL(replace), ZSTR_LEN(replace));
+		memcpy(ZSTR_VAL(result) + ZSTR_LEN(replace), ZSTR_VAL(subject) + ZSTR_LEN(prefix), remaining_len);
+		ZSTR_VAL(result)[ZSTR_LEN(replace) + remaining_len] = '\0';
+		RETURN_NEW_STR(result);
+	}
+
+	RETURN_STR_COPY(subject);
+}
+/* }}} */
+
+/* {{{ Adds suffix to subject string if subject does not already end with suffix */
+PHP_FUNCTION(str_suffix_ensure)
+{
+	zend_string *subject, *suffix;
+
+	ZEND_PARSE_PARAMETERS_START(2, 2)
+		Z_PARAM_STR(suffix)
+		Z_PARAM_STR(subject)
+	ZEND_PARSE_PARAMETERS_END();
+
+	if (ZSTR_LEN(suffix) == 0) {
+		RETURN_STR_COPY(subject);
+	}
+
+	if (ZSTR_LEN(suffix) <= ZSTR_LEN(subject) &&
+		memcmp(
+			ZSTR_VAL(subject) + ZSTR_LEN(subject) - ZSTR_LEN(suffix),
+			ZSTR_VAL(suffix), ZSTR_LEN(suffix)) == 0) {
+		RETURN_STR_COPY(subject);
+	}
+
+	zend_string *result = zend_string_alloc(ZSTR_LEN(subject) + ZSTR_LEN(suffix), 0);
+	memcpy(ZSTR_VAL(result), ZSTR_VAL(subject), ZSTR_LEN(subject));
+	memcpy(ZSTR_VAL(result) + ZSTR_LEN(subject), ZSTR_VAL(suffix), ZSTR_LEN(suffix));
+	ZSTR_VAL(result)[ZSTR_LEN(subject) + ZSTR_LEN(suffix)] = '\0';
+	RETURN_NEW_STR(result);
+}
+/* }}} */
+
+/* {{{ Removes suffix from subject string if subject ends with suffix */
+PHP_FUNCTION(str_suffix_remove)
+{
+	zend_string *subject, *suffix;
+
+	ZEND_PARSE_PARAMETERS_START(2, 2)
+		Z_PARAM_STR(suffix)
+		Z_PARAM_STR(subject)
+	ZEND_PARSE_PARAMETERS_END();
+
+	if (ZSTR_LEN(suffix) > ZSTR_LEN(subject)) {
+		RETURN_STR_COPY(subject);
+	}
+
+	if (memcmp(
+		ZSTR_VAL(subject) + ZSTR_LEN(subject) - ZSTR_LEN(suffix),
+		ZSTR_VAL(suffix), ZSTR_LEN(suffix)) == 0) {
+		RETURN_STRINGL(ZSTR_VAL(subject), ZSTR_LEN(subject) - ZSTR_LEN(suffix));
+	}
+
+	RETURN_STR_COPY(subject);
+}
+/* }}} */
+
+/* {{{ Replaces suffix in subject string if subject ends with suffix */
+PHP_FUNCTION(str_suffix_replace)
+{
+	zend_string *subject, *suffix, *replace;
+
+	ZEND_PARSE_PARAMETERS_START(3, 3)
+		Z_PARAM_STR(suffix)
+		Z_PARAM_STR(replace)
+		Z_PARAM_STR(subject)
+	ZEND_PARSE_PARAMETERS_END();
+
+	if (ZSTR_LEN(suffix) > ZSTR_LEN(subject)) {
+		RETURN_STR_COPY(subject);
+	}
+
+	if (memcmp(
+		ZSTR_VAL(subject) + ZSTR_LEN(subject) - ZSTR_LEN(suffix),
+		ZSTR_VAL(suffix), ZSTR_LEN(suffix)) == 0) {
+		size_t base_len = ZSTR_LEN(subject) - ZSTR_LEN(suffix);
+		zend_string *result = zend_string_alloc(base_len + ZSTR_LEN(replace), 0);
+		memcpy(ZSTR_VAL(result), ZSTR_VAL(subject), base_len);
+		memcpy(ZSTR_VAL(result) + base_len, ZSTR_VAL(replace), ZSTR_LEN(replace));
+		ZSTR_VAL(result)[base_len + ZSTR_LEN(replace)] = '\0';
+		RETURN_NEW_STR(result);
+	}
+
+	RETURN_STR_COPY(subject);
+}
+/* }}} */
+
 static inline void _zend_strpos(zval *return_value, zend_string *haystack, zend_string *needle, zend_long offset)
 {
 	const char *found = NULL;
diff --git a/ext/standard/tests/strings/str_prefix_ensure.phpt b/ext/standard/tests/strings/str_prefix_ensure.phpt
new file mode 100644
index 0000000000000..5492ff7176dcc
--- /dev/null
+++ b/ext/standard/tests/strings/str_prefix_ensure.phpt
@@ -0,0 +1,64 @@
+--TEST--
+Test str_prefix_ensure() function
+--FILE--
+<?php
+
+echo "*** Testing str_prefix_ensure() : various strings ***\n";
+
+$testStr = "BeginningMiddleEnd";
+
+// Does not start with prefix - should be added
+var_dump(str_prefix_ensure("The", $testStr));
+
+// Already starts with prefix - should return original
+var_dump(str_prefix_ensure("Beginning", $testStr));
+
+// Empty prefix - should return original
+var_dump(str_prefix_ensure("", $testStr));
+
+// Empty source - should add prefix
+var_dump(str_prefix_ensure("prefix", ""));
+
+// Both empty strings
+var_dump(str_prefix_ensure("", ""));
+
+// Add prefix to empty string with space
+var_dump(str_prefix_ensure(" ", ""));
+
+// Source shorter than prefix but doesn't start with it
+var_dump(str_prefix_ensure("abc", "a"));
+
+// Source equals prefix - should return original
+var_dump(str_prefix_ensure("test", "test"));
+
+// Null byte handling
+var_dump(str_prefix_ensure("\x00", $testStr));
+var_dump(str_prefix_ensure("", "\x00"));
+var_dump(str_prefix_ensure("\x00", "\x00"));
+var_dump(str_prefix_ensure("\x00", "\x00a"));
+var_dump(str_prefix_ensure("\x00", "a"));
+var_dump(str_prefix_ensure("\x00ab", "c\x00ab"));
+var_dump(str_prefix_ensure("c\x00", "\x00ab"));
+var_dump(str_prefix_ensure("a\x00d", "a\x00b"));
+var_dump(str_prefix_ensure("a\x00z", "a\x00b"));
+
+?>
+--EXPECTF--
+*** Testing str_prefix_ensure() : various strings ***
+string(21) "TheBeginningMiddleEnd"
+string(18) "BeginningMiddleEnd"
+string(18) "BeginningMiddleEnd"
+string(6) "prefix"
+string(0) ""
+string(1) " "
+string(4) "abca"
+string(4) "test"
+string(19) "%0BeginningMiddleEnd"
+string(1) "%0"
+string(1) "%0"
+string(2) "%0a"
+string(2) "%0a"
+string(7) "%0abc%0ab"
+string(5) "c%0%0ab"
+string(6) "a%0da%0b"
+string(6) "a%0za%0b"
diff --git a/ext/standard/tests/strings/str_prefix_remove.phpt b/ext/standard/tests/strings/str_prefix_remove.phpt
new file mode 100644
index 0000000000000..3a8c3f5fd6f17
--- /dev/null
+++ b/ext/standard/tests/strings/str_prefix_remove.phpt
@@ -0,0 +1,64 @@
+--TEST--
+Test str_prefix_remove() function
+--FILE--
+<?php
+
+echo "*** Testing str_prefix_remove() : various strings ***\n";
+
+$testStr = "BeginningMiddleEnd";
+
+// Matching prefix - should be removed
+var_dump(str_prefix_remove("Beginning", $testStr));
+
+// Non-matching prefix (case sensitive) - should return original
+var_dump(str_prefix_remove("beginning", $testStr));
+
+// Partial match but not at start - should return original
+var_dump(str_prefix_remove("Middle", $testStr));
+
+// Remove entire string
+var_dump(str_prefix_remove($testStr, $testStr));
+
+// Prefix longer than source - should return original
+var_dump(str_prefix_remove($testStr.$testStr, $testStr));
+
+// Empty prefix - should return original
+var_dump(str_prefix_remove("", $testStr));
+
+// Both empty strings
+var_dump(str_prefix_remove("", ""));
+
+// Empty source, non-empty prefix
+var_dump(str_prefix_remove(" ", ""));
+
+// Null byte handling
+var_dump(str_prefix_remove("\x00", $testStr));
+var_dump(str_prefix_remove("", "\x00"));
+var_dump(str_prefix_remove("\x00", "\x00"));
+var_dump(str_prefix_remove("\x00", "\x00a"));
+var_dump(str_prefix_remove("\x00bc", "\x00bca"));
+var_dump(str_prefix_remove("d\x00a", "b\x00a"));
+var_dump(str_prefix_remove("z\x00a", "b\x00a"));
+var_dump(str_prefix_remove("a\x00", "a"));
+var_dump(str_prefix_remove("\x00a", "a"));
+
+?>
+--EXPECTF--
+*** Testing str_prefix_remove() : various strings ***
+string(9) "MiddleEnd"
+string(18) "BeginningMiddleEnd"
+string(18) "BeginningMiddleEnd"
+string(0) ""
+string(18) "BeginningMiddleEnd"
+string(18) "BeginningMiddleEnd"
+string(0) ""
+string(0) ""
+string(18) "BeginningMiddleEnd"
+string(1) "%0"
+string(0) ""
+string(1) "a"
+string(1) "a"
+string(3) "b%0a"
+string(3) "b%0a"
+string(1) "a"
+string(1) "a"
diff --git a/ext/standard/tests/strings/str_prefix_replace.phpt b/ext/standard/tests/strings/str_prefix_replace.phpt
new file mode 100644
index 0000000000000..69030df3839ed
--- /dev/null
+++ b/ext/standard/tests/strings/str_prefix_replace.phpt
@@ -0,0 +1,66 @@
+--TEST--
+Test str_prefix_replace() function
+--FILE--
+<?php
+
+echo "*** Testing str_prefix_replace() : various strings ***\n";
+
+$testStr = "BeginningMiddleEnd";
+
+// Starts with prefix - should be replaced
+var_dump(str_prefix_replace("Beginning", "Start", $testStr));
+
+// Does not start with prefix - should return original
+var_dump(str_prefix_replace("Middle", "Center", $testStr));
+
+// Replace with empty string (essentially remove)
+var_dump(str_prefix_replace("Beginning", "", $testStr));
+
+// Replace empty prefix - should add prefix
+var_dump(str_prefix_replace("", "New", $testStr));
+
+// Replace with longer string
+var_dump(str_prefix_replace("http://", "https://", "http://example.com"));
+
+// Replace with shorter string
+var_dump(str_prefix_replace("/usr/local/", "/opt/", "/usr/local/bin"));
+
+// Prefix longer than source - should return original
+var_dump(str_prefix_replace("abcd", "xyz", "ab"));
+
+// Source equals prefix - replace entire string
+var_dump(str_prefix_replace("test", "replaced", "test"));
+
+// Empty source
+var_dump(str_prefix_replace("prefix", "new", ""));
+
+// Both prefix and replace empty
+var_dump(str_prefix_replace("", "", $testStr));
+
+// Null byte handling
+var_dump(str_prefix_replace("\x00", "b", "\x00a"));
+var_dump(str_prefix_replace("\x00", "\x00", "\x00a"));
+var_dump(str_prefix_replace("\x00c", "d", "\x00cab"));
+var_dump(str_prefix_replace("\x00c", "\x00d", "\x00cab"));
+var_dump(str_prefix_replace("c\x00a", "d", "b\x00a"));
+var_dump(str_prefix_replace("\x00te", "new", "\x00test"));
+
+?>
+--EXPECTF--
+*** Testing str_prefix_replace() : various strings ***
+string(14) "StartMiddleEnd"
+string(18) "BeginningMiddleEnd"
+string(9) "MiddleEnd"
+string(21) "NewBeginningMiddleEnd"
+string(19) "https://example.com"
+string(8) "/opt/bin"
+string(2) "ab"
+string(8) "replaced"
+string(0) ""
+string(18) "BeginningMiddleEnd"
+string(2) "ba"
+string(2) "%0a"
+string(3) "dab"
+string(4) "%0dab"
+string(3) "b%0a"
+string(5) "newst"
diff --git a/ext/standard/tests/strings/str_suffix_ensure.phpt b/ext/standard/tests/strings/str_suffix_ensure.phpt
new file mode 100644
index 0000000000000..c1376e5cc7b68
--- /dev/null
+++ b/ext/standard/tests/strings/str_suffix_ensure.phpt
@@ -0,0 +1,64 @@
+--TEST--
+Test str_suffix_ensure() function
+--FILE--
+<?php
+
+echo "*** Testing str_suffix_ensure() : various strings ***\n";
+
+$testStr = "BeginningMiddleEnd";
+
+// Does not end with suffix - should be added
+var_dump(str_suffix_ensure("ing", $testStr));
+
+// Already ends with suffix - should return original
+var_dump(str_suffix_ensure("End", $testStr));
+
+// Empty suffix - should return original
+var_dump(str_suffix_ensure("", $testStr));
+
+// Empty source - should add suffix
+var_dump(str_suffix_ensure("suffix", ""));
+
+// Both empty strings
+var_dump(str_suffix_ensure("", ""));
+
+// Add suffix to empty string with space
+var_dump(str_suffix_ensure(" ", ""));
+
+// Source shorter than suffix but doesn't end with it
+var_dump(str_suffix_ensure("abc", "a"));
+
+// Source equals suffix - should return original
+var_dump(str_suffix_ensure("test", "test"));
+
+// Null byte handling
+var_dump(str_suffix_ensure("\x00", $testStr));
+var_dump(str_suffix_ensure("", "\x00"));
+var_dump(str_suffix_ensure("\x00", "\x00"));
+var_dump(str_suffix_ensure("\x00", "a\x00"));
+var_dump(str_suffix_ensure("\x00", "a"));
+var_dump(str_suffix_ensure("\x00c", "ab\x00c"));
+var_dump(str_suffix_ensure("\x00c", "ab\x00"));
+var_dump(str_suffix_ensure("d\x00a", "b\x00a"));
+var_dump(str_suffix_ensure("z\x00a", "b\x00a"));
+
+?>
+--EXPECTF--
+*** Testing str_suffix_ensure() : various strings ***
+string(21) "BeginningMiddleEnding"
+string(18) "BeginningMiddleEnd"
+string(18) "BeginningMiddleEnd"
+string(6) "suffix"
+string(0) ""
+string(1) " "
+string(4) "aabc"
+string(4) "test"
+string(19) "BeginningMiddleEnd%0"
+string(1) "%0"
+string(1) "%0"
+string(2) "a%0"
+string(2) "a%0"
+string(4) "ab%0c"
+string(5) "ab%0%0c"
+string(6) "b%0ad%0a"
+string(6) "b%0az%0a"
diff --git a/ext/standard/tests/strings/str_suffix_remove.phpt b/ext/standard/tests/strings/str_suffix_remove.phpt
new file mode 100644
index 0000000000000..6178e0d3581bf
--- /dev/null
+++ b/ext/standard/tests/strings/str_suffix_remove.phpt
@@ -0,0 +1,64 @@
+--TEST--
+Test str_suffix_remove() function
+--FILE--
+<?php
+
+echo "*** Testing str_suffix_remove() : various strings ***\n";
+
+$testStr = "beginningMiddleEnd";
+
+// Matching suffix - should be removed
+var_dump(str_suffix_remove("End", $testStr));
+
+// Non-matching suffix (case sensitive) - should return original
+var_dump(str_suffix_remove("end", $testStr));
+
+// Partial match but not at end - should return original
+var_dump(str_suffix_remove("en", $testStr));
+
+// Remove entire string
+var_dump(str_suffix_remove($testStr, $testStr));
+
+// Suffix longer than source - should return original
+var_dump(str_suffix_remove($testStr.$testStr, $testStr));
+
+// Empty suffix - should return original
+var_dump(str_suffix_remove("", $testStr));
+
+// Both empty strings
+var_dump(str_suffix_remove("", ""));
+
+// Empty source, non-empty suffix
+var_dump(str_suffix_remove(" ", ""));
+
+// Null byte handling
+var_dump(str_suffix_remove("\x00", $testStr));
+var_dump(str_suffix_remove("", "\x00"));
+var_dump(str_suffix_remove("\x00", "\x00"));
+var_dump(str_suffix_remove("\x00", "a\x00"));
+var_dump(str_suffix_remove("b\x00c", "ab\x00c"));
+var_dump(str_suffix_remove("d\x00b", "a\x00b"));
+var_dump(str_suffix_remove("a\x00z", "a\x00b"));
+var_dump(str_suffix_remove("\x00a", "a"));
+var_dump(str_suffix_remove("a\x00", "a"));
+
+?>
+--EXPECTF--
+*** Testing str_suffix_remove() : various strings ***
+string(15) "beginningMiddle"
+string(18) "beginningMiddleEnd"
+string(18) "beginningMiddleEnd"
+string(0) ""
+string(18) "beginningMiddleEnd"
+string(18) "beginningMiddleEnd"
+string(0) ""
+string(0) ""
+string(18) "beginningMiddleEnd"
+string(1) "%0"
+string(0) ""
+string(1) "a"
+string(1) "a"
+string(3) "a%0b"
+string(3) "a%0b"
+string(1) "a"
+string(1) "a"
diff --git a/ext/standard/tests/strings/str_suffix_replace.phpt b/ext/standard/tests/strings/str_suffix_replace.phpt
new file mode 100644
index 0000000000000..6ec6e93b0ee45
--- /dev/null
+++ b/ext/standard/tests/strings/str_suffix_replace.phpt
@@ -0,0 +1,66 @@
+--TEST--
+Test str_suffix_replace() function
+--FILE--
+<?php
+
+echo "*** Testing str_suffix_replace() : various strings ***\n";
+
+$testStr = "BeginningMiddleEnd";
+
+// Ends with suffix - should be replaced
+var_dump(str_suffix_replace("End", "Finish", $testStr));
+
+// Does not end with suffix - should return original
+var_dump(str_suffix_replace("Middle", "Center", $testStr));
+
+// Replace with empty string (essentially remove)
+var_dump(str_suffix_replace("End", "", $testStr));
+
+// Replace empty suffix - should add suffix
+var_dump(str_suffix_replace("", "New", $testStr));
+
+// Replace with longer string
+var_dump(str_suffix_replace(".txt", ".backup.txt", "file.txt"));
+
+// Replace with shorter string
+var_dump(str_suffix_replace(".html", ".md", "document.html"));
+
+// Suffix longer than source - should return original
+var_dump(str_suffix_replace("abcd", "xyz", "ab"));
+
+// Source equals suffix - replace entire string
+var_dump(str_suffix_replace("test", "replaced", "test"));
+
+// Empty source
+var_dump(str_suffix_replace("suffix", "new", ""));
+
+// Both suffix and replace empty
+var_dump(str_suffix_replace("", "", $testStr));
+
+// Null byte handling
+var_dump(str_suffix_replace("\x00", "b", "a\x00"));
+var_dump(str_suffix_replace("\x00", "\x00", "a\x00"));
+var_dump(str_suffix_replace("\x00c", "d", "ab\x00c"));
+var_dump(str_suffix_replace("\x00c", "\x00d", "ab\x00c"));
+var_dump(str_suffix_replace("c\x00b", "d", "a\x00b"));
+var_dump(str_suffix_replace("st\x00", "new", "test\x00"));
+
+?>
+--EXPECTF--
+*** Testing str_suffix_replace() : various strings ***
+string(21) "BeginningMiddleFinish"
+string(18) "BeginningMiddleEnd"
+string(15) "BeginningMiddle"
+string(21) "BeginningMiddleEndNew"
+string(15) "file.backup.txt"
+string(11) "document.md"
+string(2) "ab"
+string(8) "replaced"
+string(0) ""
+string(18) "BeginningMiddleEnd"
+string(2) "ab"
+string(2) "a%0"
+string(3) "abd"
+string(4) "ab%0d"
+string(3) "a%0b"
+string(5) "tenew"