Introduction to Alternative syntax in PHP _php tips

Today looked at the WordPress code, there are some rare php substitution syntax,

Copy Code code as follows:

<?php Else:?>
<div class= "Entry-content" >
<?php the_content (' Continue reading <span class= ' Meta-nav ' >→</span> ', ' Thebox ')?>
<?php wp_link_pages (' Before ' => ' <div class= ' page-links ' > '. __ (' pages: ', ' Thebox '), ' after ' => ' </div>));?>
</div><!--. Entry-content-->
<?php endif;?>

What does the colon and endif behind the else represent? Rookie one, have not seen, so Google a bit, just understand that this is the substitution of PHP syntax,

A colon (:) equivalent to a left curly brace ({), endif equivalent Yu Yu curly braces (});

Let's take an example:

Copy Code code as follows:

<?php if ($a <0):?>

It's negative, pull.

Copy Code code as follows:

<?php endif;?>

The above statement is equivalent to

Copy Code code as follows:

<?php if ($a <0) {?>

It's negative, pull.

Copy Code code as follows:

<?php}?>

Do the syntax in PHP have alternative syntax?

Process Control (including If,while,forforeach,switch) These statements have alternative syntax.

The basic form of alternative syntax:

The left curly brace ({) is replaced with a colon (:), and the right curly brace (}) is replaced with Endif;,endwhile;,endfor;,endforeach; and Endswitch;

While substitution syntax:

Copy Code code as follows:

<?php while (expr):?>
<li> Circular Dot What </li>
<?php Endwhile;?>

Other alternative grammars can be analogous.