5 Most Useful PHP String Functions You Should Know

When we start working with PHP String functions, we have to learn some useful string operation using PHP predefined functions.

Today we talk about some most used String functions which use to manipulate user defined strings. There are 5 most used PHP string manipulation functions listed below,

Complete Explanation of PHP String functions

Substr in PHP (PHP substr())

Substr in PHP, also on the full form is called PHP substring. In PHP substring we cut out some part of the string from where we want. Using PHP substr(), in this function, we pass the required parameter than execute for getting the result. Below check the syntax of the PHP substr() function.

substr(string_name, start_position, string_length_to_cut)

PHP substr() Example:


<?php

// PHP program to explain substr()
function PHPSubstring($str){
$len = strlen($str);
echo substr($str, 4), "<br/>";
echo substr($str, 5, $len), "<br/>";
echo substr($str, -2, 8), "<br/>";
echo substr($str,-4, -5), "<br/>";
}

// Driver Code
$str="PHPcoderTECH";
PHPSubstring($str);

?>

//Output: oderTECH
        derTECH
        CH

<?php

// PHP program to explain substr()

function PHPSubstring($str){

$len = strlen($str);

echo substr($str, 4), "<br/>";

echo substr($str, 5, $len), "<br/>";

echo substr($str, -2, 8), "<br/>";

echo substr($str,-4, -5), "<br/>";

}

// Driver Code

$str="PHPcoderTECH";

PHPSubstring($str);

//Output: oderTECH

derTECH

PHP String Length (PHP strlen())

Using PHP strlen() function we can get the length of the string.

strlen($string)

PHP strlen() Example:

<?php
// PHP program to find the
// length of a given string

$str = "php coder tech";

// prints the length of the string
// including the space
echo strlen($str);
?>

//O/U: 14

<?php

// PHP program to find the

// length of a given string

$str = "php coder tech";

// prints the length of the string

// including the space

echo strlen($str);

//O/U: 14

PHP String Replace (php str_replace, php regex replace)

In PHP, if we want replace any particular string, any integer or any type of data we use php str_replace() function. Example shown below.

PHP str_replace() Example:

<?php
$my_str = 'If the facts do not fit the theory, change the facts.';

// Display replaced string
echo str_replace("facts", "truth", $my_str);
?>

<?php

$my_str = 'If the facts do not fit the theory, change the facts.';

// Display replaced string

echo str_replace("facts", "truth", $my_str);

PHP String Cast

<?php
$string_var = "string value for php type";
$int_var = (int)$string_var;
var_dump($int_var);
?>

<?php

$string_var = "string value for php type";

$int_var = (int)$string_var;

var_dump($int_var);

User Editor to check the O/P: Click Here

PHP Escape String (escape_string PHP)


Either escape the quote:

$text1= "From time to \"time\"";
or use single quotes to denote your string:

$text1= 'From time to "time"';

Either escape the quote:

$text1= "From time to \"time\"";

or use single quotes to denote your string:

$text1= 'From time to "time"';

Check the PHP official site to know more,

https://www.php.net/manual/en/language.types.string.php

5 Most Useful PHP String Functions You Should Know

Complete Explanation of PHP String functions

Substr in PHP (PHP substr())

PHP String Length (PHP strlen())

PHP String Replace (php str_replace, php regex replace)

PHP String Cast

PHP Escape String (escape_string PHP)

Also Read:

By Bikash

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