<?php $str = 'hello world'; $cnt = count(array_filter(str_split($str), function ($v) { return ord($v) % 3 == 0; })); echo 'total count- '.$cnt . PHP_EOL; $cnt = array_reduce(str_split($str), function ($c, $v) { return $c + (ord($v) % 3 == 0 ? 1 : 0); }, 0); echo 'total count- '.$cnt . PHP_EOL;
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