3v4l.org

run code in 300+ PHP versions simultaneously
<?php $psr4 = array( 'my\\first\\ns\\prefix\\' => 0, 'my\\second\\ns\\prefix\\' => 0, 'my\\third\\ns\prefix' => 0, ); foreach ($psr4 as $prefix => &$v) { $v = strlen($prefix); } $classes = array( 'my\\third\\ns\\prefix\\subns\\class', 'another\\ns\\prefix\\subns\\class', ); for ($i = 0; $i < 1000; $i++) { foreach ($classes as $class) { foreach ($psr4 as $prefix => $length) { if (!strncmp($class, $prefix, $length)) { //echo "$class -> $prefix\n"; break; } } } }

preferences:
39.36 ms | 402 KiB | 5 Q