PHP count_chars()函数讲解

<?php 
$str = "Hello World!"; 
echo count_chars($str,3); 
?>

count_chars( _string,mode_ )

<?php 
$str = "Hello World!"; 
echo count_chars($str,4); 
?>

<?php 
$str = "Hello World!"; 
print_r(count_chars($str,1)); 
?>

<?php 
$str = "PHP is pretty fun!!"; 
$strArray = count_chars($str,1); 
foreach ($strArray as $key=>$value) 
{ 
echo "The character <b>'".chr($key)."'</b> was found $value time(s)<br>"; 
} 
?>