3v4l.org

run code in 500+ PHP versions simultaneously
<?php $bom = "\xFF\xFE"; $str = $bom.$bom.'john'; $removeStr = substr($str, strlen($bom)); $removeStrMb = mb_substr($str, mb_strlen($bom)); var_dump( $removeStr === $bom.'john', $removeStrMb === $bom.'john', );
Output for 8.3.2 - 8.3.35, 8.4.1 - 8.4.26, 8.5.0 - 8.5.11
bool(true) bool(false)
Output for 8.1.0 - 8.1.34, 8.2.0 - 8.2.34, 8.3.0 - 8.3.1
bool(true) bool(true)

preferences:
230.4 ms | 1139 KiB | 9 Q