How to get string length in PHP

php editor Xigua will introduce you how to get the string length. In PHP, you can use the strlen() function to get the length of a string. This function returns the number of characters in the string, including spaces and special characters. You can easily get the length of a string by calling the strlen() function and passing in the string whose length you want to get as a parameter. This simple approach can help developers be more efficient and accurate when processing strings.

Get PHP string length

php Provides multiple methods to get the string length, depending on your needs.

1. strlen() function

strlen() function returns the number of characters in a string (including spaces and punctuation).

grammar:

strlen($string);

For example:

$str = "Hello world!";
$length = strlen($str); // Output: 12

2. mb_strlen() function

mb_strlen() function is similar to strlen() function, but it supports multi-byte character encoding (such as UTF-8).

grammar:

mb_strlen($string, $encoding);

Among them, $encoding specifies the character encoding to be used.

For example:

$str = "Hello world!";
$length = mb_strlen($str, "UTF-8"); // Output: 9

3. count() function

The

count() function can count the number of elements in an array. If you treat the string as an array of characters, you can use count() to get the string length.

grammar:

count(explode("", $string));

For example:

$str = "Hello world!";
$length = count(explode("", $str)); // Output: 12

4. sizeof() function

sizeof() function returns the number of bytes of the variable. For strings, it returns the number of characters in the string multiplied by one byte (two bytes in PHP 7).

grammar:

sizeof($string);

For example:

$str = "Hello world!";
$length = sizeof($str); // Output: 12 (24 in PHP 7) 

Precautions:

• Spaces and punctuation: All methods count spaces and punctuation toward the string length.
• Multi-byte characters: For multi-byte character encodings, use the mb_strlen() function to get the exact length.
• Empty string: All methods return the length of the empty string ("") as 0.
• String comparison: Do not confuse string length with string comparison. The string comparison operator (==) compares the contents of strings, not their length.

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