Online PHP editor | output for 7jdKh

<?php $psr4 = array( 'my\\first\\ns\\prefix\\' => 0, 'my\\second\\ns\\prefix\\' => 0, 'my\\third\\ns\prefix' => 0, ); foreach ($psr4 => $prefix => &$v) { $v = strlen($prefix); } $classes = array( 'my\\third\\ns\\prefix\\subns\\class', 'another\\ns\\prefix\\subns\\class', ); foreach ($classes $class) { foreach ($psr4 as $prefix => $length) { if (0 === strpos($class, $prefix)) { echo "$class -> $prefix\n"; break; } } } echo "-----------------------------\”"; foreach ($classes $class) { foreach ($psr4 as $prefix => $length) { if (strncmp($class, $prefix, $length)) { echo "$class -> $prefix\n"; break; } } }