PHP5.6 cannot execute the exec function in centos.

This article details why PHP5.6 cannot execute the exec function in centos. Linux-PHP5.6 cannot execute the exec function in centos.

I have removed this function from disable_functions, and no error is reported, but no execution is performed.
I found a lot on the Internet and said "security mode", but 5.6 does not have the security mode, and I have changed the code operation permission to 777.

I have removed this function from disable_functions, and no error is reported, but no execution is performed.
I found a lot on the Internet and said "security mode", but 5.6 does not have the security mode, and I have changed the code operation permission to 777.

Preliminary judgment is selinux's pot ......

Php. ini safe_mode = On can I try this? but the operation can only be performed in the directory set by safe_mode_exec_dir.

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