(PHP 4, PHP 5)
shell_exec — Execute command via shell and return the complete output as a string
cmdThe command that will be executed.
The output from the executed command or NULL if an error occurred or the
command produces no output.
Note:
This function can return
NULLboth when an error occurs or the program produces no output. It is not possible to detect execution failures using this function. exec() should be used when access to the program exit code is required.
Example #1 A shell_exec() example
<?php
$output = shell_exec('ls -lart');
echo "<pre>$output</pre>";
?>
Note:
当 PHP 运行在 安全模式 时，不能使用此函数。