anisgazig at gmail dot com ¶ 10 months ago
If you want your file to be interpreted as php then your file must start and end with <?php and ?> and everything outside of that is ignored by the php parser.
<?php
php code..//parsed
php code..//parsed
?>
hellow..//normal test but ignred by php parser
Three types of tag are available in php
1.normal tag(<?php ?>)
2.short echo tag(<?= ?>)
3.short tag(<? ?>)
short tag are bydefault available but can be disabled by short_open_tag = Off and also disabled bydefault if php will built with --disabe--short--tags()
As short tag can be disabled so only use the normal and short echo tag.
If your file only have php code then do not use closing tag.
<?php
//php code;
//php code;
//php code;but if you are embedding php with html then enclose php code with opening and closing tag.
<html>
<head>
</head>
<body>
<?php
//php code;
//php code;
//php code;?>
</body>
</html>
If you want to just print single text or something ,you should use shorthand version .<?= $var ?>
But if you want to process something, you should use normal tag.
<?php
//$var = 3;
//$var2 = 2;
//$var3 = $var+$var2;
//if($var3){//result}?>
If you embedded php with html and single line, do not need to use semicolon
<html>
<head>
<body>
<?= $var ?>
</body>
</head>
</html>
but if you have multiple line, then use semicolon.
<?php
//line 1;
//line 2;
//line 3;
?>
Definition and UsageA PHP code script is a text file having .php extension and is stored on web server. The PHP parser on server looks for special sequence of characters <?php and ?>. These are called PHP's opening and closing tags. Statements witihn these two are interpreted by the parser. PHP script within these tags can be embedded in HTML document, so that embedded code is executed on server, leaving rest of the document to be
processed by client browser's HTML parser. Syntax<?php
//one or more PHP statements
..
..
?> Short tagsPHP allows a using a shorter representation of opening tag <? instead of cannonical usage <?php if it s enabled in php.ini file by enabling short_open_tag in php.ini file <?
//one or more PHP statements
..
..
?> PHP VersionThis setting is recommended to be Off for production environment. Use of ASP style tags <%, %> and <script
language="PHP"> has been discontinued since PHP 7.0 Following example shows use of PHP tags Example Live Demo <?php
//cannonical PHP tags
echo "Hello World";
?> OutputThis will produce following result − Hello World PHP supports a short echo tag <?= which is equivalent to the more verbose <?php echo. Example Live
Demo <?= "Hello World";
?> OutputThis will produce following result − Hello World Example using short tags Example Live Demo <?php
//set short_open_tag=on
echo "Hello World";
?> OutputThis will produce following result − Hello World
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What is
The <= tag is called short open tag in PHP. To use the short tags, one must have to enable it from settings in the PHP. ini file. First of all ensure that short tags are not disabled, To check it, go into php.
php and ?>. These are called PHP's opening and closing tags. Statements witihn these two are interpreted by the parser. PHP script within these tags can be embedded in HTML document, so that embedded code is executed on server, leaving rest of the document to be processed by client browser's HTML parser.
According to the docs, it's preferable to omit the closing tag if it's at the end of the file for the following reason: If a file is pure PHP code, it is preferable to omit the PHP closing tag at the end of the file.
From the PHP Manual: The closing tag of a PHP block at the end of a file is optional, and in some cases omitting it is helpful when using include() or require(), so unwanted whitespace will not occur at the end of files, and you will still be able to add headers to the response later.
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