Phpexec usage details

: This article describes how to use phpexec. if you are interested in the PHP Tutorial, refer to it. Exec function parsing

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

Exec return value: string

Exec parameter description

Command-Command to be executed

Array-is the output value

Return_var-returns 0 or 1. if 0 is returned, the execution is successful. if 1 is returned, the execution fails.

Exec failed, debugging solution

One trick is to use the pipeline command. with 2> & 1, the command will output the $ output variable error during shell execution and output the variable for analysis.

For example:

Exec ('convert a.jpg B .jpg ', $ output, $ return_val );

Changed:

Exec ('convert a.jpg B .jpg 2> & 1', $ output, $ return_val );

Print_r ($ output );

Example:

Running the java parsing command with exec on win2003 has never been successful:

C: \ Progra ~ 1 \ Java \ jdk1.8.0 _ 73 \ bin \ java.exe-jar c: \ p \ java \ test. jar

After the command is appended with 2> & 1, it is amazing.

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 usage of php exec, including relevant content, and hopes to help those who are interested in PHP tutorials.