Program execution function Library: PassThru

PassThru

(PHP3, PHP4)

PassThru---&http://www.aliyun.com/zixun/aggregation/37954.html ">nbsp; Execute an external program and display raw (RAW) output

Syntax: void passthru (String command [, int return_var])

Description:

PassThru () is similar to exec (), and if a parameter return_var is given, the status of the UNIX command returned will be placed here. The output from the UNIX command is binary data that needs to be transferred directly to the refer, which can be used instead of exec () or system (). To perform an instruction like Pbmplus utility, you can directly output graphics streams, set Content-type as Image/gif, and then call the Pbmplus program to output an GIF, and you can create a PHP program to output graphics directly.

Note: If you use this function to start a program and you want to leave it in the background (background), you must make sure that the output of the program is turned (redirected) to a file or some output stream, otherwise PHP will hang (hang) Until the program execution is finished.

Reference: EXEC () system () Popen () Escapeshellcmd ()