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This article mainly explains "what does exec return in php". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn what exec returns in php.

In PHP, the exec () function returns the last line of the result of the command execution. This function is used to execute an external program. When the output parameter of the function is specified, the output is populated with the returned result. If there is already an element in the output parameter, the exec function will append the output.

This article operating environment: Windows10 system, PHP7.1 version, Dell G3 computer.

What does exec return in php

Exec () returns the last line of the specified command result by default, specifies the output parameter, and populates the output; with the returned result. If there is already an element in the output parameter, exec () is appended to the output.

Exec executes an external program

Description

Exec (string $command, array & $output =?, int & $return_var =?): string

Exec () executes the command specified by the command parameter.

Parameters.

The command to be executed by command.

If output provides the output parameter, the array is populated with the output executed by the command, with each line of output populating an element in the array. The data in the array does not contain white space characters at the end of the line, such as\ ncharacters. Note that if the array already contains some elements, the exec () function appends to the end of the array. If you don't want to append the array, use the unset () function to reset the array before passing in the exec () function.

If return_var provides both the output and return_var parameters, the return status after the command execution is written to this variable.

Return value

The last line of the result of the command execution. If you want to get the output of the command, be sure to use the output parameter.

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