在PHP中编写一个程序，用于查找一个字符在字符串中出现的次数

<?php $str = "welcome to tutorials point"; $str = str_replace(" ","",$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'."

"; } ?>

Output

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

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