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Re:On PHP 5.3's Namespace Backslash Backlash: The PHP Intern... by vulpes on Friday July 31, 2009 @04:05PM (#735249)
Because a single colon is used in an alternative if/else/foreach etc syntax:

  <?php if($var == true): ?>  
  Hello world  
  <?php else: ?>  
  Cake is a lie  
  <?php endif; ?>
Edit: syntax
Re:On PHP 5.3's Namespace Backslash Backlash: The PHP Intern... by kenver on Friday July 31, 2009 @07:18PM (#735636)
It's also used in the ternary operator

  x = condition ? if_true : if_false;
Re:On PHP 5.3's Namespace Backslash Backlash: The PHP Intern... by shaunxcode on Friday July 31, 2009 @04:50PM (#735347)
stun taken - I seriously had forgotten about that.