(PHP 4, PHP 5, PHP 7)
shell_exec — Execute command via shell and return the complete output as a string
shell_exec ( string $cmd ) : string
This function is identical to the backtick operator.
Note:
On Windows, the underlying pipe is opened in text mode which can cause the function to fail for binary output. Consider to use popen() instead for such cases.
cmd
The 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>";
?>
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https://www.php.net/manual/en/function.shell-exec.php