PHP returns the length of the string function strlen ()

Instance

The function returns the length of the string "Hello":

<?phpecho strlen ("Hello");? >

Definition and usage

The strlen () function returns the length of the string.

Grammar

Strlen (String)

Parameters	Describe
String	Necessary. Specifies the string to check.

technical details

return value:
php version:	4+
update log:

More examples

Example 1

Returns the length of the string "Hello World":

<?phpecho strlen ("Hello world!");? >

In PHP, the function strlen () returns the length of the string. The function prototypes are as follows:

int strlen (string string_input);

The parameter string_input is the string to be processed.

The strlen () function returns the byte length of a string, with an English letter, a number, and a variety of symbols representing one byte, each of which has a length of 1. A noon character occupies two bytes, so the length of a noon character is 2. For example

<?php Echo strlen ("www.sunchis.com"); echo strlen ("Tri-Knowledge Development Network");?>

"Echo strlen (" www.sunchis.com "); Operation Result: "Echo strlen (" Three-Knowledge Development Network "); Running results: 15

Here's a question, does a Chinese character account for 2 bytes? "Three-knowledge Development network", is clearly five characters, the results of the operation is 15?

The reason is here: strlen () calculation, for a UTF-8 of Chinese characters, it will be treated as a length of.