How to execute shell in php

php provides us with three functions: system(), exec(), and passthru() to call external commands.

Related recommendations: "php Getting Started Tutorial"

Although these three commands can execute the shell commands of the Linux system, they are actually different:

·system() Outputs and returns the last line of shell results.

·exec() does not output results and returns the last line of shell results. All results can be saved in a returned array.

·passthru() only calls the command and outputs the result of the command directly to the standard output device as is.

Same point: you can get the status code of command execution.

Example:

system("/usr/local/bin/webalizer/webalizer");

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