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How does PHP exec work?
The exec() function is an inbuilt function in PHP which is used to execute an external program and returns the last line of the output. It also returns NULL if no command run properly.
Is PHP exec safe?
2 Answers. It’s only a security hole if you let your user enter parameters. I.E., you shouldn’t do this: // DO NOT DO THIS!
Can you run Javascript in PHP?
You can execute Javascript through PHP by calling javascript code/function as a string in PHP and send it to the client browser to execute.
Why do we need to enable exec function in PHP?
PHP uses the function to execute a program and it returns the last line of the output. Many WordPress image optimization plugins make use of this function. Hence WordPress users often approach us to enable this function. PHP has certain dangerous functions that can make a server vulnerable to attacks.
What happens if you use exec more than once in PHP?
On Windows-Apache-PHP servers there is a problem with using the exec command more than once at the same time. If a script (with the exec command) is loaded more than once by the same user at the same time the server will freeze. In my case the PHP script using the exec command was used as the source of an image tag.
How to run shell-PHP Shell _ Exec ( ) on Linux?
Open /etc/passwd file, find line with www-data user and change it’s login shell (last one) from /bin/false (or whatever) to /bin/bash. Open www-data’s terminal: su www-data. Try php -v or whatever You can’t execute from php. If it does not work — You’ll see nice logs and will be able to debug problem.
How to start a process in PHP exec-manual?
This small class is made so you can keep in track of your created processes ( meaning start/stop/status ). You may use it to start a process or join an exisiting PID process. echo “The process is not running.”; $command = ‘nohup ‘.$this->command.’ > /dev/null 2>&1 & echo $!’;