How to check total occurrence of a character in string - php

Question

I want to find out total occurrence of particular character in string.
my code is:
$str = 'aabbbcccccaa';
for ($i=0;$i<strlen($str);$i++){
$len = 0;
for ($j=$i;$j<=strlen($str);$j++){
if($str[$i] == $str[$j]){
$len++;
}
}
echo "\n".$str[$i].' len is '.$len;
}
my output is like:
a len is 4
a len is 3
b len is 3
b len is 2
b len is 1
c len is 5
c len is 4
c len is 3
c len is 2
c len is 1
a len is 2
a len is 1
but I want something like:
a len is 4
b len is 3
c len is 5 only
How can I achieve this?

Answer 1

RTM
<?php
$data = "Two Ts and one F.";
foreach (count_chars($data, 1) as $i => $val) {
echo "There were $val instance(s) of \"" , chr($i) , "\" in the string.\n";
}
?>

Answer 2

You should use substr_count(). It's right here in the manual:
http://php.net/manual/en/function.substr-count.php
or perhaps count_chars() would be even better for a generic solution:
http://php.net/manual/en/function.count-chars.php
Always check the manuals before creating something yourself.. there just might be a function there that does exactly what you want..

Answer 3

$str = 'aabbbcccccaa';
foreach (count_chars($str, 1) as $i => $val) {
echo chr($i), " len is $val " , "<br>";
}

Answer 4

Hello Simply Implement the bellow way !
Our Custom Function :
function count_chars_unicode($str, $x = false) {
$tmp = preg_split('//u', $str, -1, PREG_SPLIT_NO_EMPTY);
foreach ($tmp as $c) {
$chr[$c] = isset($chr[$c]) ? $chr[$c] + 1 : 1;
}
return is_bool($x)
? ($x ? $chr : count($chr))
: $chr[$x];
}
Usage :
print_r(count_chars_unicode('aabbbcccccaa', true));
O/P
Array ( [a] => 4 [b] => 3 [c] => 5 )
print_r(count_chars_unicode('aabbbcccccaa', 'a')); // frequency of "a"
O/P : 4
print_r(count_chars_unicode('aabbbcccccaa')); // count of uniq chars
O/P : 3