<시간/> 예시
<?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'."\n";
}
?> 출력
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
