The execution body {} In a PHP conditional statement can be: instead? solution

The execution body {} In a PHP conditional statement can be: instead of??
The execution body {} In a PHP conditional statement can be: instead of??

A recent code that looks at someone else has found something interesting that I didn't know before, nor did I mention it in the book.

such as the normal writing of the judgment statement
if ($a ==1)
{
EXECUTE statement
}
Now it's possible to find this.
if ($a ==1):
EXECUTE statement
endif


The second kind of can actually write is also a kind of compatible writing, do not know this to performance has no effect??
Please know the friend to do a solution ....

------Solution--------------------
http://php.chinaunix.net/manual/zh/migration.if-endif.php

Earlier versions of the syntax, not recommended to use the
------Solution--------------------
The Process Control substitution syntax in PHP:

PHP provides some alternative syntax for process control, including If,while,for,foreach and switch.

The basic form of substitution syntax is to replace the left curly brace ({) with a colon (:) and the right curly brace (}) into Endif;,endwhile;,endfor;,endforeach; and Endswitch

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