strlen(): Length of the string
Measure string length
strlen() returns the number of bytes in a string. For UTF-8 text where you need character count, use mb_strlen() with the appropriate encoding.
$text = 'plus2net';
echo strlen($text); // 8 bytes
$utf8 = 'café';
if (function_exists('mb_strlen')) {
echo mb_strlen($utf8, 'UTF-8'); // 4 characters
}
echo strlen('plus2net.com'); // Ouptut is 12
For form input validation, check whether input is present and validate the expected length. `strlen()` counts bytes, not user-visible Unicode characters.
PHP function strlen returns number of bytes inside the string including blank space. If you want blank space to be removed then you can apply string replace function str_replace to the string before applying strlen.
$string="This is my string";
echo "Length of the string = ".strlen($string);
Length of the string after removing blank spaces
We will use str_replace function to search and replace all occurrences of blank space.$string="This is my string";
$string=str_replace(" ","",$string);
echo "Length of the string = ".strlen($string);
Maximum and minimum length of string
For an ASCII-only user ID, validate the byte length against the required limits. For international text, use a Unicode-aware length check and explicit validation rules.$userId = "abcdababcdababcs";
$length = strlen($userId);
if ($length >= 6 && $length <= 15) {
echo "Length is within 6 to 15 bytes";
} else {
echo "Length must be between 6 and 15 bytes";
}
Nullable inputs and strlen()
$value = null;
$text = $value ?? '';
echo strlen($text); // 0
echo strlen(''); // 0
null directly to strlen() is deprecated in PHP 8.1+. Normalize nullable input to a string first (as shown above), then separately validate whether a required field was actually provided.
strlen() returns bytes, not Unicode characters. The mb_strlen() example requires the mbstring extension. strrev(): PHP string reverse
String Functions strrev(): PHP string reverse nl2br() To add Line break
Subhendu Mohapatra
Author & Instructor at plus2net
I write and maintain practical tutorials on Python, PHP, SQL, JavaScript, HTML, jQuery, and web development at plus2net. The tutorials focus on clear explanations, working examples, and code that readers can test and adapt while learning.
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| elyn espanola | 05-02-2012 |
| what are the php codes of counting different letters from 2 words that given by the users and each word will be equal to the number of letters that are different to the other words. for example: cat=1 bratt=2 since in the word cat,there is no letter c in the other word so it equals to 1, then in the second word, there is no letter b and r in the first word so it equals to 2,tnx,,i need ur ideas. | |
| dickson | 07-12-2012 |
| nice stuff. home 4 the best. tank | |
