PHP STRINGS - SINGLE QUOTED PHP STRINGS

The simplest form of PHP strings is the single quoted PHP string; it consists in putting the chain of characters constituting your string between single quotes (for instance, consider the PHP string $s = 'understanding').


The particularities of single quoted PHP strings are the following:

• if you intend to have a literal single quote in your chain of characters, you need to escape it with a backlash \ in order to prevent it from being mistaken with the single quote which terminates the string.
  
  Learn the PHP code:
  

  <?php $s = 'Here\'s how you do it'; echo $s; ?>

  
  Run the PHP script in your web browser:
  
  
  
• likewise, if you intend to have a backlash followed by a single quote within your chain of characters, you need to double the backlash, etc ...
  
  Learn the PHP code:
  

  <?php $s = 'String terminating with (one) backlash \\'; echo $s; ?>

  
  
  Run the PHP script in your web browser:
  
  
• if you intend to terminate your chain of characters with a backlash, you need to double it.
• PHP variables within single quoted strings are not parsed.
  
  Learn the PHP code:
  

  <?php $var = 1; $s = 'The variable $var will not be parsed'; echo $s; ?>

  
  
  Run the PHP script in your web browser:
  
  

PHP STRINGS - DOUBLE QUOTED PHP STRINGS

The essential difference between a single quoted PHP string and a double quoted PHP string lies in the fact that a PHP variable will be parsed in the latter and won't be parsed in the former.
Learn the PHP code:

<?php $var = 1; $s = "The variable $var will now be parsed"; echo $s; ?>

Run the PHP script in your web browser: