How to calculate string length in php? The following article will introduce to you two built-in functions strlen() and mb_strlen() in PHP to calculate the length of strings, and see their differences.
to return the length of the given string string.
Return value: If successful, the length of the string string is returned; if string is empty, returns 0.
Examples based on interview questions:
$str = 'hello'; echo strlen($str), '<br>'; //5 $str1 = '中国'; echo strlen($str1), '<br>'; //6 echo strlen($str4), '<br>'; //0
UTF-8 encodes a Chinese character and occupies 3 bytes gdk encodes a Chinese character and occupies 2 bytes
The following is the gdk encoding
$str2 = 'hello'; echo strlen($str2), '<br>'; //5 $str3 = '中国'; echo strlen($str3), '<br>'; //4 echo strlen($str4), '<br>'; //0
—Get the length of the string
Return value: Return the number of characters contained in the string str with encoding encoding . Returns FALSE if the given encoding is invalid. encoding is the character encoding.
$str = '你好中国'; echo strlen($str), '<br>'; //12 $str1 = '你好中国'; echo mb_strlen($str1, 'utf-8'), '<br>'; //4
gbk Two bytes and one character
strlen is the calculation of string 'byte' length - string length
mb_strlen is to calculate the length of string 'characters'
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