PHP Basic: String Data Type Step By Step Tutorial

PHP Basic: String Data Type

Tag: data type, string Category: PHP Basic
post: 01 Mar 2008 read: 218

PHP Basic Data Type Step By Step Tutorial - Part 5: String is a group of character. In PHP, a character is considered to be become a byte so that there is 256 character differ. A string literal can be expressed with three ways of differing: Single Quoted, Double Quoted, Heredoc Sintax.

Single Quoted

String can be expressed with single qoute clasp. With a single qoute, the variable which exist in it will be considered as a string literal so that value which exist in the variable do not be presented.

Pay attention to the script as following: File name : string.php


<Html>
<head>
<title>String Data Type</title>
</head>
<body>
<?
	$article = 'Using PHP';
	echo 'This is string'.'<br>';
	echo 'you also can insert newlines 
        in string like this way.'.'<br>';
	echo 'Harry say : I\'ll be back'.'<br>';
	echo 'Are you sure you want to delete D:\\*.*?'.'<br>';
	echo 'Are you sure you want to delete D:\*.*?'.'<br>';
	echo ' am trying to include at 
        this point : \rn a newline'.'<br>';
	echo '$article'.'<br>';
?>
</body>
</html>

The result of executing string.php:

Double Quoted

If the string is expressed flankedly by Double Quoted, PHP recognizes the more special character (character escape). Differ from single qoute, variable which exist in Double Quoted will be presented by its value.

Table character escape

Character	Info
\n	Linefeed (10) in ASCII
\r	Carriage return (13) in ASCII
\t	Tabulation horizontall (9) in ASCII.(
\\	Backslash
\$	Dollar sign
\"	Double quoted
[0-7]{,3}	Character in Octal
x[0-9A-Fa-f]{1,2}	Character ini Hexadecimal

Pay attention to the example of script using String data type with double quoted as following:
File name : string1.php


<Html>
<head>
<title>String Data Type</title>
</head>
<body>
<?
	$article = 'Using PHP';
	echo "This is string"."<br>";
	echo "you also can insert newlines 
        in string like this way."."<br>";
	echo "Harry say : I\"ll be back"."<br>";
	echo "Are you sure you want to delete D:\\*.*?"."<br>";
	echo "Are you sure you want to delete D:\*.*?"."<br>";
	echo '"am trying to include 
        at this point : \rn a newline"."<br>";
	echo "$article"."<br>";

?>
</body>
</html>

The result of string.php :

Heredoc Sintax ("<<<")

String also can limit by using the sign of heredoc sintax ("<<<"). Identifier writes after the sign <<<, followed string, then it is covered with same identifier

Pay attention to the example of using String data type with heredoc sintax at script as following:
File name: string2.php


<html>
<head>
<title>String Data Type</title>
</head>
<body>
<h1>The using of Heredoc Sintax</h1>
<? 
$article = <<<TEST
Using PHP
TEST;
echo <<<DOC
yielded string use Heredoc Sintax<br>
\$article= $article
DOC;
?>
</body>
</html>

The result of string2.php:

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