<?php $str = "welcome to (cainiaojc.com)"; $str = str_replace(" ","",$str); $arr = str_split($str); foreach ($arr as $key =>$val){ if (!isset($output[$val])){ $output[$val] = 1; } else{ $output[$val] += 1; } } foreach($output as $char =>$number){ echo $char." ".'appears '. $number." ".'times'."\n"; } ?>
输出结果
w appears 1 times e appears 2 times l appears 2 times c appears 1 times o appears 4 times m appears 1 times t appears 4 times u appears 1 times r appears 1 times i appears 2 times a appears 1 times s appears 1 times p appears 1 times n appears 1 times