Detailed explanation of alternative syntax in PHP

This article mainly introduces the detailed explanation of alternative syntax in PHP. Interested friends can refer to it. I hope it will be helpful to everyone.

• What is alternative syntax?
  Simply put, they are some alternative ways of writing grammar.

#2. What syntaxes have alternative syntaxes in PHP?

if, while, for, forforeach, switchThese flow control statements have alternative syntax.

3. Basic form of alternative syntax:

The left curly brace ({) is replaced by a colon (:), and the right The curly braces (}) are replaced with endif;, endwhile;, endfor;, endforeach; and endswitch;

Usage:

if-endif usage:

<?php if ($a<0): ?> 
    <li>if里面的输出</li> 
<?php endif; ?> 
    上面的语句等同于 
<?php if （$a<0）{ ?> 
    if里面的输出
<?php } ?>

while-endwhile usage:

<?php while (expr): ?> 
    <li>循环while里面的输出</li> 
<?php endwhile; ?>

for-endfor usage:

<?php foreach (expr1): ?> 
    <li>循环for里面的输出</li> 
<?php endforeach; ?>

switch-endswitch usage:

<?php 
switch ($i): 
    case 1: 
        echo "i 等于 1"; 
        break; 
    case 2: 
        echo "i 等于 2"; 
        break; 
    default: 
        echo "i 不等于1和2"; 
endswitch; 
?>

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##Introduction to alternative syntax in PHP, introduction to PHP alternative syntax

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