What Does Php Exec() Provide Value Of V Mean?

I accept been trying to know if the exec() command inwards php executes successfully or non thence that I tin impress sure enough messages accordingly.
In the command
 exec($command, $return_array, $return_value) 
If y'all execute inwards a higher house command via PHP as well as snuff it $return_array every bit empty as well as $return_value every bit 5, as well as then that agency something is wrong. If the command successfully executes, it should provide a value of 0.
 v agency Access denied.  Similarly, Here are listing of to a greater extent than or less mutual provide codes as well as what they agency  0 The functioning completed successfully.  ane Incorrect function.  two The organization cannot detect the file specified.  three The organization cannot detect the path specified.  four The organization cannot opened upwards the file.  v Access is denied.  vi The grip is invalid.  seven The storage command blocks were destroyed.  viii Not plenty storage is available to procedure this command.  nine The storage command block address is invalid.  10 The environs is incorrect.  . . . 

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