String in PHP

String is a sequence of characters.

It is denoted by single or double quote.

It is used to store and manipulate text.

E.g.1

<?php 

$name='LearningPoint92';  //denoted by single quote

echo $name; 

?> 

Output:

 LearningPoint92

E.g.2

<?php 

$name="LearningPoint92";  //denoted by double quotes

echo $name; 

?> 

Output:

 LearningPoint92

  String functions 
   There are some predefined functions in string like strlen(), strrev(), strpos() etc.

strlen() function

strlen() function returns the length of a string. In below example strlen() function is used to return length of "Hello India"

Example:

<?php

echo strlen("Hello India");

  ?>
Output:
11

str_word_count() function

str_word_count() function is used to count numbers of words in given string

Example:

<?php

echo str_word_count("Hello india");

?>
Output:
2

strrev() function
strrev() function is used to reverse a string

Example:

<?php

echo strrev("Hello india");

?>

Output:

aidnia olleH

strpos() function

strpos() function is used to search specific position of any words in given string
Example:

<?php

echo strpos("Hello india", "india");

?>

Output:

6

str_replace() function
str_replace function is used to replaces some characters with some other characters in a string. In below example we replace india with  world .

Example:

<?php

 echo str_replace("india", "world", "Hello india");

   ?>
Output:
  Hello world

strtolower() function
strtolower() function is used to convert uppercase letter into lowercase letter.

Example:

 <?php

  $str="Hey i am KAJOL"; 

$str=strtolower($str); 

echo $str; 

?>
Output:
 hey i am kajol

strtoupper() function

strtoupper() function is used to convert lowercase letter into uppercase letter
Example:

<?php

$str="hey i am kajol"; 

$str=strtoupper($str); 

echo $str; 

?>

Output:

HEY I AM KAJOL

ucwords() function

ucwords() function is used to convert first letter of every word into upper case.

Example:

<?php

$str="hey i am kajol"; 

$str=ucwords($str); 

echo $str; 

?>

Output:

Hey I Am Kajol

ucfirst() function

ucfirst() function converting first character into uppercase.

Example:

<?php

$str="hey i am kajol"; 

$str=ucfirst($str); 

echo $str; 

?>

Output:

Hey i am kajol

lcfirst() function

lcfirst() function converting first character into lowercase

Example:

<?php

$str="Hey i am kajol"; 

$str=lcfirst($str); 

echo $str; 

?>

Output:

hey I am kajol