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@ 2017-05-22T09:00:16Z

<?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
Performance
VLD
References
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var_dump: documentation ( source)

preferences:dark modelive previewkey bindings

25.19 ms | 404 KiB | 5 Q