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PHP Manual :: Execution Operators



Error Control Operators || Incrementing/Decrementing Operators || Operators || PHP Manual

PHP supports one execution operator: backticks (``). Note that these are not single-quotes! PHP will attempt to execute the contents of the backticks as a shell command; the output will be returned (i.e., it won't simply be dumped to output; it can be assigned to a variable). Use of the backtick operator is identical to shell_exec().

<?php
$output 
= `ls -al`;
echo 
"<pre>$output</pre>";
?>

Note:

The backtick operator is disabled when safe mode is enabled or shell_exec() is disabled.

Note:

Unlike some other languages, backticks have no special meaning within double-quoted strings.

See also the manual section on Program Execution functions, popen() proc_open(), and Using PHP from the commandline.



Error Control Operators || Incrementing/Decrementing Operators || Operators || PHP Manual
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