Briefly describe what php tags are

## is the parser (long tag) of PHP. All code that needs to be run must be placed in the parser.

<?php
echo "hello world";
?>

Short tag<% %> (Recommended learning: PHP Programming from Beginner to Master)

Short tags are only used to output variables or expressions. The general usage is

<?=$a?>
<?=(表达式)?>

, which is equivalent to

<?php echo $a?>
<?php echo (表达式)?>

. It does not support structures such as if and for.

If you write

<?if(...?>

, it will become

<!--if(...-->

. Open the short tag. Open the short tag in PHP.INI: short_open_tag = On, PHP default tag character < ;?php ?>

So you must use long tags when writing programs, and short tags will be used when inserting output into html.

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