A string is a group of characters, where a character is equivalent to a byte. This implies PHP just supports a 256-character set and subsequently doesn’t offer local Unicode support.
ex:-

Single quote (‘) :-

Single quote strings are the most straightforward approach to indicate string. Single quote is utilized to indicate string when we need the string to be actually as it is composed.

	<?php
	//Single quote String
	$number = 123456; //This is valriable with number or value
	$number1 = 'This is DevOpsSchool';
	$var = 'This is Single quote String';//This is variable with value
	echo '$number $number1 This is value'; //Output:- $number $number1 This is value
	echo '<br>'; //This is line break
	echo $var; // Output:- This is Single quote String
	?>

view raw single-quote-string.php hosted with by GitHub

Here, used single quote string so not displayed or output your data value. Here work as a string. If you want to print correct data value then add in Double quote string.

Double quote (“):-
Double quoted strings are used to print any value of a variable in PHP. It will show a large group of got away characters, and variables in the strings will be assessed. A significant point here is that you can use curly braces to isolate the name of the variable you want to be evaluated.

	<?php
	//Double quote String
	$number = 123456; //This is valriable with number or value
	$number1 = "This is DevOpsSchool'";
	$var = "This is Single quote String";//This is variable with value
	echo "$number $number1 This is value"; //Output:- 123456 This is DevOpsSchool' This is value
	echo "<br>"; //This is line break
	echo $var; // Output:- This is Single quote String
	?>

view raw double-quote.php hosted with by GitHub

Here, Double quote string uses to print or display variables of data.

Heredoc (<<<):- It works similarly as the double quote.

	<?php
	//Heredoc String
	echo <<< MYDATA
	This is heredoc
	example in php
	MYDATA; // Output:- This is heredoc example in php
	echo "<br>"; // Output:- This is line break
	echo <<< DATA
	This is heredoc second
	example in php.
	DATA; //Output :- This is heredoc second example in php.
	?>

view raw heredoc.php hosted with by GitHub

Here, used heredoc syntax in this where (echo <<< ANYDATA) then, right if (echo <<< ANYDATA ) you want to any space or any tab then show error.

Nowdoc (<<<‘ ‘):- It works similarly as a single quote.

	<?php
	//nowdoc
	echo <<< "MYDATA"
	This is Nowdoc
	example in PHP
	MYDATA;
	echo "<br>";
	//You can write thus,
	echo <<< 'DATA'
	This is Nowdoc
	example in PHP
	DATA;
	echo "<br>";
	//You can also write thus,
	$nowdoc = <<<'A'
	You can also defined as.
	A;
	var_dump($nowdoc);
	?>

view raw nowdoc-syntax.php hosted with by GitHub

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Rajesh Kumar

I’m a DevOps/SRE/DevSecOps/Cloud Expert passionate about sharing knowledge and experiences. I am working at Cotocus. I blog tech insights at DevOps School, travel stories at Holiday Landmark, stock market tips at Stocks Mantra, health and fitness guidance at My Medic Plus, product reviews at I reviewed , and SEO strategies at Wizbrand. 

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