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PHP strlen() function

Syntax

  strlen ( string ) ;
  
Parameter Description
String String to check (Required)

Definition

It returns number of character in a string.

Usage

Strlen function is used to find the length of a string.

strlen() often comes in useful if you want to validate a string to make sure it ’ s the correct length. For example, the following code makes sure that the string variable $name must be 5 characters long.

Example of strlen function

  <?php
$name="John";
if ( strlen( $name ) != 5 ) 
{
echo "Correct input.";
}
else 
{
echo "incorect input";
}
?>
  

Output

Correct input

You can validate form by using strlen function with the help of conditional statement like if else.

Example of strlen function

<?php

echo "Length of sting:";

echo strlen("welcome to PHP");

?>

In above example directly pass the string into the strlen function and print the result.

More example of strlen function

<?php

$a="Hypertext pre-processor";

echo $a."
"; echo "Number of character in this string with white space and special symbol: "; echo strlen($a); ?>

$a is a string variable that hold a string with white spaces and special symbol and pass it to the strlen function that return the number of character including white spaces and special symbol.

.

Note: Whitespaces are also a part of the string.

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