Comparative analysis of PHP one-dimensional array traversal methods

//a
$arr=array('a'=>'abc','b'=>123,'c'=>true);
//b
//$arr=range('a','d');
//1
for($i=0;$iecho $arr[$i]. ', ';
echo '';
//2
foreach($arr as $key)
echo "$key, ";
echo '';
// 3
foreach($arr as $key=>$val)
echo "$key-$val, ";
echo '';
//4
reset($arr);
while ($item=each($arr)){
echo $item['key'].'-'.$item['value'].', ';
}
echo '';
//5
reset($arr);
while(list($key,$val)=each($arr)){
echo "$key-$val, ";
}
echo '';
?>

Code description:

Statement a $arr=array('a'=>'abc','b'=>123,'c'=>true); Initialize $arr to get the numeric index array, output: , , , abc, 123, 1, a-abc, b-123, c-1, a-abc, b-123, c-1, a-abc, b-123, c-1, use statement b $arr=range('a','d'); to initialize $arr to get the associative array, output: a, b, c, d, a, b, c, d, 0-a, 1-b, 2-c, 3-d, 0-a, 1-b, 2-c, 3-d, 0-a, 1-b, 2-c, 3-d, The for loop only has limited numeric indexes; after the for and foreach traversal, the data does not need to be reset() to be available for the next traversal, while the each method does.

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