I do not understand this PHP Code, what is it doing?

 

This question already has an answer here:

  • Reference — What does this symbol mean in PHP? 18 answers

  • colons - this is a shorthand version of statements, you should not really learn them at such an early stage. First you need to learn the full versions.

  • <?= $variable ?> is a short version of <?php echo $variable ?> but means exactly the same.

    • Also, the shordhand versions from question one are actually not considered a good practice, because when you nest them they are hard to read.

    Colons on lines 1 and 3 are an alternative way of doing the below code 

    if (!empty($data)) {
    ...
}

    It makes it a lot cleaner when outputting HTML.

    (See http://php.net/manual/en/control-structures.alternative-syntax.php)

    <?= is a shorthand way of writing <?php echo , again it's just an alternative way of doing things.

    (See http://php.net/manual/en/function.echo.php)

    你可以在php中写很多类型的循环......例如：if（condition）{... code ...} else {... code ...}或if（condition）：代替“ {“你可以使用”：“并结束循环使用”endif“2）你的第2点是用php的shortcode编写的，因为你必须在php.ini中启用shortcode

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