PHP String Functions

PHP String functions

PHP has over 75 built-in String manipulation functions, supporting operations ranging from string repetition and reversal to comparison and search-and-replace. Some of these important functions are

Here's example illustrating these operators in action

Eg ii ( strrev( ) )

<?php
	
$val="nitin";
	
if(strrev($val)==$val)
	
echo "Your name is palindrome";
	
else
	
echo "Your name is not palindrome";
  
?>

In the above example,
Declare variable $val hold value="nitin". Here we use strrev() Function to give reverse of a string.
We pass strrev() function inside If condition. if the reverse string is equal to declared string.
it will print "Your name is palindrome" otherwise "Your name is not palindrome"

Eg iii (str_repeat( ) )

<?php
    
$val="welcome ";
   
 echo str_repeat($val,3);
  
 ?>

In the above example,
Declare variable $val with value="welcome".
use str_repeat( ) function with two argument. first argument declare name of variable, second argument we define number of times print the value.
The output is (welcome welcome welcome) because we pass 3 second argument.

Eg iv ( str_replace( ) )

<?php
  	
$str="welcome";
	
echo str_replace("e","@",$str);
  
?>

In the above example,
Declare variable $str with value="welcome".
use str_replace( ) function. It accepts three argument: the search term, the replacement term, and the string on which perform replacement.
we have Passed str_replace("e","@",$str) and the output is : W@lcom@ because "@" replaced by "e".

Eg v ( str_word_count( ) )

<?php
  
$str="hello  user how r you";
  
echo str_word_count($str);
  
?>

In the above example,
Use str_word_count( ) function is used to count the number of word in a string.
declare variable $str value="hello user how are you".
pass this function inside echo so the output is :5 (count words separated by space)

Eg vi ( strcmp( ) )

<?php
$str="hello";	
$str1="HELLO";	
echo strcmp($str,$str1);  
?>

In the above example,
declare two variable $str value=("hello")
$str1 with value=("HELLO")
Now compare two string using strcmp( ) function.
display the output i.e 1 because both variable doesn't contain same value(one is in lowercase while other in uppercase).

Eg vii(strlen( ))

<?php
    
if(isset($_GET['sub']))
	
{
		
if(empty($_GET['n']))
		
{
		
echo "<font color='red'>fill your name first</font>";
		
}
		
else
		
{
			
if(strlen($_GET['n'])<5)
			
{
			
echo "<font color='red'>name must be greater than 5</font>";
			
}
			
else
			
{
			
echo "welcome ".$_GET['n'];
			
}
		
}
	
}

?>

<form>

	Enter your name<input type="text" name="n"/>

	<input type="submit" name="sub" value="show my name"/>

</form>

Eg viii ( strpos( ) )

<?php
       
$str="welcome";
       
echo strpos($str,"l");
  
?>

Eg ix ( nl2br( ) )

<?php
	
$str1="hello 
	
user
	
how 
	
are
	
you";
	
echo nl2br($str1);
  
?>

Eg x( substr( ) )

<?php
	
$str="welcome to the world of php";
	
echo substr($str,24,3);
 
?>

In the above example,
substr( ) function is used to slice string into smaller section.
it accepts three argument: (given string ,the position at which start slicing , and the number of character return from the starting position ).
$str hold a string value="welcome to the world of php" now pass substr($str,24,3) function inside echo and the output will become: php