Stdlib: mb_strstr() missing — undefined function fatal (ext/mbstring/mbstring.c)

[PurHur]

Category

stdlib · implementation-ready

Problem

mb_strstr() is missing from the VM — function_exists('mb_strstr') returns false and calls fatal with undefined function. Zend provides this in ext/mbstring/mbstring.c.

Sibling functions mb_strpos(), mb_stripos(), mb_strrichr() are all registered; mb_strstr() is the gap.

php-src reference

• php/php-src ext/mbstring/mbstring.c — PHP_FUNCTION(mb_strstr)

Repro

<?php
var_dump(mb_strstr('Hello World', 'World'));        // string(5) "World"
var_dump(mb_strstr('Hello World', 'World', true));  // string(6) "Hello "
var_dump(mb_strstr('Hello World', 'xyz'));           // bool(false)

Engine	Result
Zend	Works as above
VM	Fatal: Call to undefined function mb_strstr()

Scope

• ext/mbstring/mb_strstr.php — new builtin using VmMbstring::strpos() + VmString::utf8CharSubstr()
• ext/mbstring/Module.php — register
• test/compliance/cases/stdlib/mb_strstr.phpt

Done when

• mb_strstr() works on VM matching Zend
• $before_needle and $encoding params supported
• Compliance PHPT green

[PurHur]

claim: PHP Compiler Ext — I/O & Crypto — starting this run