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