Discussion and association on the use of PHP end tags_PHP tutorial

When PHP parses a file, it looks for the opening , which tell PHP to start and stop interpreting the code within it. This method of parsing allows PHP to be embedded in various documents. Any content outside a pair of opening and closing tags will be ignored by the PHP parser. In most cases PHP is embedded in HTML documents.

Single-line comments only comment to the end of the line or to the current block of PHP code, whichever comes first. This means that the HTML code after // ... ?> or # ... ?> will be displayed: ?> jumps out of PHP mode and returns to HTML mode, // or # has no effect at this point.

It can be seen from the above discussion that even if ?> appears in the // comment, the PHP parser will consider that PHP parsing is over (when PHP encounters the end mark?>, it will simply follow it The contents of are output as is (unless immediately followed by a new line, see command separator) until the next start tag is encountered).

Copy code The code is as follows:

//$a = 'testtest';
//preg_match_all('| ]+href="([^"]*)".*?>|', $a, $b);
//print_r($b);

The output is:

Copy the code The code is as follows:

:!php preg.php
| ', $a, $b);
//print_r($b);

How to fix the above problem? Or you use /* */ to comment, or use ?> Use string concatenation characters to connect, as follows:

Copy code The code is as follows:

$ a = 'testtest';
preg_match_all('|]+href="([^"]*)".*?'.'>|', $a, $b);
print_r($ b);

This detail also applies to JS closing tag

http://www.bkjia.com/PHPjc/326549.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/326549.htmlTechArticleWhen PHP parses a file, it looks for start ?php and end tags?, which tell PHP to start and stop interpretation. code in it. This method of parsing allows PHP to be embedded into various documents...