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PHP Quiz PHP CertificatePHP count_chars() Function
Example
Return a string with all the different characters used in "Hello World!" (mode 3):
<?php
$str = "Hello World!";
echo count_chars($str,3);
?>
$str = "Hello World!";
echo count_chars($str,3);
?>
Run example »
Definition and Usage
The count_chars() function returns information about characters used in a string (for example, how many times an ASCII character occurs in a string, or which characters that have been used or not been used in a string).
Syntax
count_chars(string,mode)
| Parameter | Description |
|---|---|
| string | Required. The string to be checked |
| mode | Optional. Specifies the return modes.
0 is default. The different return modes are:
|
Technical Details
| Return Value: | Depending on the specified mode parameter |
|---|---|
| PHP Version: | 4+ |
More Examples
Example 1
Return a string with all the unused characters in "Hello World!" (mode 4):
<?php
$str = "Hello World!";
echo count_chars($str,4);
?>
$str = "Hello World!";
echo count_chars($str,4);
?>
Run example »
Example 2
In this example we will use count_chars() with mode 1 to check the string. Mode 1 will return an array with the ASCII value as key and how many times it occurred as value:
<?php
$str = "Hello World!";
print_r(count_chars($str,1));
?>
$str = "Hello World!";
print_r(count_chars($str,1));
?>
Run example »
Example 3
Another example of counting how many times an ASCII character occurs in a string:
<?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>";
}
?>
$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>";
}
?>
Run example »
Complete PHP String Reference
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