PHP function array_filter how to filter elements in an array with a callback function

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Array_filter uses callback functions to filter elements in the array.

Function test_odd ($var) {return ($var & 1);} $a1=array ("a", "b", 2jin3jade 4); print_r (array_filter ($A1, "test_odd"))

Output:

Array

(

[2] = > 2

[3] = > 3

[4] = > 4

)

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