3v4l.org

run code in 300+ PHP versions simultaneously
<?php $input = 'lorem lis pum'; for( $i = 0, $ilen = strlen( $input ), $result = array(); $i < $ilen; $i++ ) { $chr = $input[ $i ]; if( $chr === ' ' ) { $chr = '_'; } $result[ $chr ] = isset( $result[ $chr ] ) ? $result[ $chr ] + 1 : 1; } var_dump( $result );
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 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 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13
array(10) { ["l"]=> int(2) ["o"]=> int(1) ["r"]=> int(1) ["e"]=> int(1) ["m"]=> int(2) ["_"]=> int(2) ["i"]=> int(1) ["s"]=> int(1) ["p"]=> int(1) ["u"]=> int(1) }
preferences:
138.02 ms | 408 KiB | 5 Q