PHP鲜为人知的可选语法形式

你知道PHP有一种可选的语法结构吗？直到我开始写wordpress主题时，我才了解。当时看到那种奇怪的写法，我去php.net查询了一下，找到了这篇文章。（http://php.net/manual/en/control-structures.alternative-syntax.php） PHP的这种可选语法可以让PHP更加的简单和易读。控制结构if,while,for,foreach,及switch都有相应的可选语法。通常来说，我推荐在将PHP和HTML混编的时候使用这种可选的语法。

下面看几个具体的例子。

If Example

// This....
if($myString == "foo"):
    echo "bar";
else:
    echo "no-foo-bar";
endif;
 
//...is equal to this.
if($myString == "food") {
    echo "bar";
} else {
    echo "no-foo-bar";
}

ForEach Example

$names = array("bob", "tom", "john");
 
//This....
foreach($names as $name):
    echo "Your name is: {$name}";
endforeach;
 
//...is equal to this.
foreach($names as $name) {
    echo "Your name is: {$name}";
}

While Example

$finaldir = \'download\';

$finished = false;                       // we\'re not finished yet (we just started)
while ( ! $finished ):                   // while not finished
  $rn = rand();                          // random number
  $outfile = $finaldir.\'/\'.$rn.\'.gif\';   // output file name
  if ( ! file_exists($outfile) ):        // if file DOES NOT exist...
    $finished = true;                    // ...we are finished
  endif;
endwhile;                                // (if not finished, re-start WHILE loop)