PHP String

A string like a variable that is created first. You can use the string stored in function and another way you also store in a variable .
In the below example, we will create a string and will store in a variable after we will print the variable through echo.

<?php
$str = "String goes here ";
echo "After string is goes here !";
echo $str ; 
?>
		
		

Parameters:-
$str – A variable
String goes here – A string
The echo – Echo used to display the value.

PHP String functions:-

The Length of a String:-

The PHP strlen() function used to find out the length of string .
The following example of strlen() function .

Example

<?php
echo strlen("Learn PHP "); // outputs 9
?>

ENTER YOUR TEXT:



<?php
if(isset($_POST["submit"]))
{
 $name=$_POST['name'];
 echo "Length:";
 ;
	echo strlen("$name");
}
?>

Str_words_count() function-

The PHP str_word_count() function used for counts the number of words of complete string .

Example

<?php
echo str_word_count("Learn PHP "); // output 2
?>

ENTER YOUR TEXT:


















$lt;?php
if(isset($_POST["submit"]))
{
 $text=$_POST['text'];
 echo "Word Count:";
	echo str_word_count ("$text");
}
?>	

PHP strrev()-

The PHP strrev() function used to reverse the complete string .

Example

<?php
echo strrev("Hello Learn Here")// outputs ereH nrael olleh
?>

ENTER YOUR TEXT:


















<?php
if(isset($_POST["submit"]))
{
 $text=$_POST['text'];
 echo "Reverse Text :";
	echo strrev("$text");
}
?>		

PHP str_replace() function -

The PHP str_replace() function used to replaces some characters with some other characters in a string.
The example below replaces the text "world" with "Dolly":
In bellow example we will replaces the text “Learn “ with “Study”:

Example

<?php
echo str_replace("Learn", "Study", "Learn PHP "); // outputs Study PHP !
?>

Enter Your Text:



Enter Word For Replace:



New Word :

















<?php
if(isset($_POST["submit"]))
{
 $text=$_POST['text'];
  $change =$_POST['change'];
   $new=$_POST['new'];
 echo "Replaced String :";
	echo str_replace("$change","$new","$text");
}
?>

strpos() function :-

The PHP strpos() function used for search a text(String) within a string .
If the text match within a string the fuction gives position of text that you are finding if not found match it gives FALSE
In the bellow example we will search “you” in the string “How are you ?“.

Example

<?php
echo strpos("How are you ?", "You "); // outputs 9
?>

Enter Text Here:



Search:






<?php
if(isset($_POST["submit"]))
{
 $text=$_POST['text'];
  $search=$_POST['search'];
 echo "Position:";
	echo strpos("$text","$search");
}
?>

Strcmp() fuction:-

The fuction strcmp() is used for compares two string .

Name :



 

 Compare :


















<?php
if(isset($_POST["submit"]))
{
 $name=$_POST['name'];
  $compare=$_POST['compare'];
 echo "Compared :";
	echo strcmp("$name","$compare");
}
?>

Strtolower():-

The Strtolower() is used for convert complete string to lower case .

Example

<?php
$str="TECHNO SMARTER";

$res=strtolower($str);//for lower case 
echo $res;

?//Output  techno smarter

>

Enter Capital String :


















<?php
if(isset($_POST["submit"]))
{
 $text=$_POST['text'];

	echo strtolower("$text");
}
?>

Strtoupper() Function -

The Strtoupper() is opposite to string to lower function that used for convert complete string to upper case .

Enter Small String :


















<?php
if(isset($_POST["submit"]))
{
 $text=$_POST['text'];

	echo strtoupper("$text");
}


?>

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