PHP数组具有的特性有哪些

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$arr = [1 => 'ok', 'one' => 'hello'];

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foreach($arr as $key => $value){

 echo $arr[$key];

}

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$arr = [1 => 'ok', 'one' => 'hello', 'a' => 'world'];

echo $arr['one'];

echo current($arr);

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$arr = [1, 2, 3];

$arr[] = 4;

array_push($arr, 5);