Which function in php can get the length of a string?

php get string length function strlen and mb_strlen
count() - Count in the array The number of units, or the number of attributes in the object
strlen - Get the length of the string, a Chinese character is 3 characters
mb_strlen() - Get the length of the string

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int strlen (string $string)
Returns the length of string if successful; if string is empty, returns 0.

Example

<?php
$str = &#39;abcdef&#39;;
echo strlen($str); // 6
$str = &#39;abcdef中国&#39;;
echo strlen($str); // 12
echo mb_strlen($str);//12
echo count($str);//1
$str = &#39; ab cd &#39;;
echo strlen($str); // 7
?>

Note:
strlen() returns the number of bytes rather than the number of characters in a string.
strlen() returns NULL when executed on arrays, and an E_WARNING level error is emitted.

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