Output function definition
If you know a function name, how do you know what the function is without looking at the source code?
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You can only speculate by the reaction.
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This is similar to guessing the chemical composition, and then to test, to verify the conjecture.
First guess the content, the estimated results. Test again. See if the result is the same as the conjecture.
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Only by guessing.
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PHP has its own reflection mechanism, including classes, functions have corresponding classes, you go to see the manual a bit more
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Array_rand Rand
Array_merge Merge ...
Slowly associate
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