What to do if popen cannot be used in php

Solution to the problem that popen cannot be used in php: Change the user of the directory or file by executing the [chown www.www -R dir] command, or execute the [chmod 764] command to change the file permissions.

Cause analysis:

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1. Permissions Question

If you perform file/directory operations, you need to pay attention to whether PHP has operation permissions. You can use the chown and chmod commands to modify the owner and operation permissions. chown www.www -R dir changes the owner of the directory or file chmod changes file permissions chmod 764.

2. Do not use abbreviations or omit parameters.

On the server, it is OK to use the ll command or svn up to update the current directory, but when using it in php, it does not work. Any result, it is speculated that the analysis and processing of the command are different between the two, that is, the execution environment, not simply PHP passing the command to the shell. When using it later, try to add all the required parameters.

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