PHP EXEC Usage Detailed

exec function Parsing

EXEC syntax: string exec (String command, string [array], int [return_var]);

EXEC return Value: string

EXEC parameter description

command– commands to execute

array– is the output value

The return_var– is a return value of 0 or 1, and if return 0 succeeds, the execution fails with return of 1.

exec unsuccessful, debug scenario

One technique is to use the pipe command, which uses 2>&1, and the command outputs the error of the shell execution to the $output variable, which can be parsed.

Such as:

EXEC (' Convert a.jpg b.jpg ', $output, $return _val);

Switch

EXEC (' Convert a.jpg b.jpg 2>&1 ', $output, $return _val);

Print_r ($output);

Example:

Running on Win2003 with exec executing the Java Parsing command has been unsuccessful:

C:\progra~1\java\jdk1.8.0_73\bin\java.exe-jar C:\p\java\test.jar

After the command was appended 2>&1, the magic succeeded.

EXEC ("C:\progra~1\java\jdk1.8.0_73\bin\java.exe-jar C:\p\java\test.jar 2>&1", $output, $return _val);

The above describes the PHP exec usage details, including the aspects of the content, I hope the PHP tutorial interested in a friend helpful.

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