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php empty array

//To clear array you are able to simply re-instantiate it
$foo = array();

//To clear $foo from the symbol table use
unset($foo);
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declare empty array in php

$emptyArray = []; 
$emptyArray = array();
$emptyArray = (array) null;
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php empty array

$emptyArray = []; 
$emptyArray = array(); 
$emptyArray = (array) null;
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php create empty array with size

$my_array = array_fill(0, $size_of_the_array, $some_data);
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How to empty an array in php

unset($foo); // $foo is gone
$foo = array(); // $foo is here again
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