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Strings in PHP

In PHP, A String is a sequence of characters which are enclosed with single quotes or double quotes.

There are 2 ways to specify string

  • Single Quotes      Ex: $str=' Hello PHP ';
  • Double Quotes      Ex: $str=" Hello PHP ";

Where in Single quoted string, we can store multiline text, special characters and escape sequences.Where in Double quoted string, we can't use special characters directly.

☞ Double quoted string :

Example:

$age = 20; 
$str1="Your age is : $age";		// string1
echo $str1;
$str2="Your age is : '$age'";	// string2
echo $str2;

Output:

Your age is : 20
Your age is : '20'


☞ Single quoted string :

Example:

$age = 20; 
$str1='Your age is : $age';		//string1
echo $str1;
$str2='Your age is : "$age"';	//string2
echo $str2;

Output:

Your age is : $age
Your age is : '$age'

☞ String Function in PHP

PHP provides various string functions to perform different operations on strings i.e. to access and manipulate strings. Those are,

☞ strtolower() :

It returns string in lowercase letters i.e. it converts given string into lowercase.

Example:

$str="StudyGLANCE";
$str1=strtolower($str);
echo $str1;

Output:

studyglance

☞ strtoupper() :

It returns string in uppercase letters i.e. it converts given string into uppercase.

Example:

$str="StudyGLANCE";
$str1=strtoupper($str);
echo $str1;

Output:

STUDYGLANCE

☞ ucwords() :

It converts first character of each word in given string into uppercase.

Example:

$str="study glance";
$str1=ucwords($str);
echo $str1;

Output:

Study Glance

☞ strlen() :

It returns the length of given string.

Example:

$str="study glance";
$len=strlen($str);
echo "Length of given string : $len";

Output:

Length of given string : 12

☞ strrev() :

It returns the given string in reverse.

Example:

$str="study glance";
$str1=strrev($str);
echo $str1;

Output:

ecnalg yduts

☞ str_word_count() :

It returns the number of words in the given string.

Example:

$str="study glance";
$wc=str_word_count($str);
echo $wc;

Output:

2

☞ strpos() :

It searchs for a specific text within a string. If a match is found, this function returns the character position of the first match. If no match is found, it will return false.

Example:

$str="study glance";
$pos=strpos($str,"glance");
echo $pos;

Output:

6

☞ str_replace() :

It replaces some characters with another characters in the given string.

Example:

$str="study glance";
$str1=str_replace("glance","world",$str);
echo $str1;

Output:

study world

☞ substr() :

It returns the sub-string from the given string.

Example:

$str="study glance";
$str1=substr($str,6);
$str2=substr($str,0,4);
echo $str1;
echo $str2;

Output:

glance
study

Example: "Strfundemo.php"


<html>

<head>

<title>String Functions</title>

</head>

<body>

<h1>String Functions Demo</h1>

<?php

$str="I am study GLANCE";

echo "<strong>String in Lower case : </strong>".strtolower($str)."<br/>";

echo "<strong>String in Upper case :</strong> ".strtoupper($str)."<br/>";

echo "<strong>String in Word case :</strong> ".ucwords($str)."<br/>";

echo "<strong>Length of the String :</strong> ".strlen($str)."<br/>";

echo "<strong>String reverse :</strong> ".strrev($str)."<br/>";

echo "<strong>No of Words in String :</strong> ".str_word_count($str)."<br/>";

echo "<strong>Position of Sub-string :</strong> ".strpos($str,"am")."<br/>";

echo "<strong>String replace :</strong> ".str_replace("GLANCE","World",$str)."<br/>";

echo "<strong>Sub-string from given String :</strong> ".substr($str,5,5)."<br/>";

?>

</body>

</html>

Output :

image
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