php exec output

php exec output

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The output from the executed command or NULL if an error occurred or the command produces no output. Note: This function can return NULL both when an error occurs or the program produces no output. It is not possible to detect execution failures using thi, PHP system()、exec()、shell_exec() 的差異. system()、exec()、shell_exec() 官方文件說明如下: system — Execute an external program and display the output. string system ( string $command [, int &$return_var ] ). exec — Execute an external program. string exec ( strin,If the output argument is present, then the specified array will be filled with every line of output from the command. Trailing whitespace, such as -n, is not included in this array. Note that if the array already contains some elements, exec() will appen, You should redirect stderr to stdout. To do that, change your exec() call like this: exec("ping -c 1 $domain_bad 2>&1", $output, $return_var);. More info about 2>&1 meaning here.

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