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PHP5.6 cannot execute the exec function under centos

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Release： 2016-09-06 08:42:54
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I have removed this function in disable_functions. No error is reported, but it is not executed either.
I found a lot of information on the Internet saying that it is safe mode, but there is really no safe mode in 5.6, and I have changed the running permission of the code to 777

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