3 methods in PHP to count the number of each character in a string and sort them_PHP Tutorial

Copy code The code is as follows:

//This method is purely a memorization of functions and no explanation;
function countStr($str){
$str_array=str_split($str);
$str_array=array_count_values($str_array);
arsort($str_array);
return $str_array;
}
//The following is an example;
$str="asdfgfdas323344##$$fdsdfg*$**$*$**$$443563536254fas";
print_r(countStr($str));
?>
//This method has some data structure ideas, but it is still easy to understand:)
function countStr2($str){
$str_array=str_split ($str);
$result_array=array();
foreach($str_array as $value){//Determine whether the character is a new type, if so, set it to 1, if not, set it automatically Add;
if(!$result_array[$value]){
$result_array[$value]=1;
}else{
$result_array[$value]++;
}
}
arsort($result_array);
return $result_array;
}
$str="asdfgfdas323344##$$fdsdfg*$**$*$**$$443563536254fas" ;
var_dump(countStr2($str))
?>
//This method is purely a lame version of solution one. First find the general class of all characters, and then Use the substr_count function to count one by one.
function countStr3($str){
$str_array=str_split($str);
$unique=array_unique($str_array);
foreach ($unique as $v){
$ result_array[$v]=substr_count($str,$v);
}
arsort($result_array);
return $result_array;
}
$str="asdfgfdas323344##$ $fdsdfg*$**$*$**$$443563536254fas";
var_dump(countStr3($str));
?>

*No matter which method is used , all use the str_split function, so this function is very important~

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