Determine shell_exec execution result in php

When doing third-party login, downloading the avatar during registration is time-consuming, so it is changed to asynchronous shell_exec to execute wget

However, shell_exec has no output after successful execution and null is returned when execution fails. It is a problem to distinguish when recording error logs. .

I found the method of differentiation in the comments of the php manual, and I will record it here.

$shell = "wget -O despath sourcepath &&  echo 'success' ";
$shellExec = shell_exec($shell);
var_dump($shellExec);

In this way, when the previous execution is successful, the echo will be executed. The execution result is success instead of empty.

If the execution fails, the echo will not continue to be executed. The execution result is still null.

This way, the execution result is distinguished and the corresponding record is recorded. The log is OK.

The above introduces the judgment of shell_exec execution results in PHP, including the relevant aspects. I hope it will be helpful to friends who are interested in PHP tutorials.