php - Which is the best - Using built in functions or writing my own? -

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which 1 faster , good? writing own functions or using in built function in php eg. converting 2d array 1d array. have use 

array_merge($array1)

or writing own function using

foreach(){    }

in general, predefined php functions faster. written in c, therefore faster, no matter how write own php functions.

if write them yourself, have more control , power on outcome. have decide whats necessary in case.


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