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<?php var_dump(mb_strpos('ABC-ÖÄÜ-💩-' . "\xc3\x28" . '中文空白-中文空白' . "\xf0\x28\x8c\x28" . 'abc', '白', -8));
Output for 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
int(20)
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 int(20)
Output for 5.6.0 - 5.6.25, 7.0.0 - 7.0.20
Warning: mb_strpos(): Offset not contained in string in /in/TsMA9 on line 3 bool(false)

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167.41 ms | 402 KiB | 202 Q