PHP String

PHP string is a sequence of characters i.e., used to store and manipulate text. PHP supports only 256-character set and so that it does not offer native Unicode support. There are 4 ways to specify a string literal in PHP.

1. single quoted
2. double quoted
3. heredoc syntax
4. newdoc syntax (since PHP 5.3)

A string is a sequence of characters, like ‘PHP supports string operations.’ A string in PHP as an array of bytes and an integer indicating the length of the buffer.

To cut a part of a string and return it as a new string, we can use the substr function:

$filename = "image.png";
$extension = substr($filename, strlen($filename) - 3);
echo "The extension of the file is $extension";

<?php  
$str1='Hello text   
multiple line  
text within single quoted string';  
$str2='Using double "quote" directly inside single quoted string';  
$str3='Using escape sequences \n in single quoted string';  
echo "$str1 <br/> $str2 <br/> $str3";  
?>

1. “\n” is replaced by a new line
2. “\t” is replaced by a tab space
3. “\$” is replaced by a dollar sign
4. “\r” is replaced by a carriage return
5. “\\” is replaced by a backslash
6. “\”” is replaced by a double quote
7. “\’” is replaced by a single quote

• The string starting with a dollar sign(“$”) are treated as variables and are replaced with the content of the variables.

<?php  
class heredocExample{  
        var $demo;  
        var $example;  
        function __construct()  
        {  
                $this->demo = 'DEMO';  
                $this->example = array('Example1', 'Example2', 'Example3');  
        }  
    }  
    $heredocExample = new heredocExample();  
    $name =  'Gunjan';  
      
    echo <<<ECO  
    My name is "$name". I am printing some $heredocExample->demo example.  
    Now, I am printing {$heredocExample->example[1]}.  
    It will print a capital 'A': \x41  
ECO;  
 ?>