Array_map/array_filter/array_walk the way the array is traversed is like foreach, who wants to be faster?

Array_walk equivalent to foreach:

$arr = ['Client'=>'jQuery','Server'=>'PHP'];array_walk($arr, function($v, $k) {    echo "键:$k 值:$v\n";});

For example, remove the front and back blanks of the array $arr elements:

array_walk($arr, function(&$v) { $v = trim($v); });foreach($arr as &$v) { $v = trim($v); }array_filter: 用回调函数过滤数组中的单元,返回过滤后的数组var_export(    array_filter([1, 2, 3], function($v) {        return $v > 1;    }));和foreach([1, 2, 3] as $k => $v) {    if($v > 1) {        $tmp[$k] = $v;    }}var_export($tmp);都输出:array (  1 => 2,  2 => 3,)

PHP Array Map Simplification (MapReduce):

array_map/array_reducearray_map: 将回调函数作用到给定数组的单元上var_export(    array_map(function ($v) {        return $v * $v;    }, [1, 2, 3]));和foreach([1, 2, 3] as $v) {    $tmp[] = $v * $v;}var_export($tmp);都输出:array (  0 => 1,  1 => 4,  2 => 9,)

Array_reduce: Iterating over the array simplification (reduce) to a single value using a callback function
Output 16, which is 10+1+2+3, where 10 is the initial value.

echo array_reduce([1, 2, 3], function($result, $item) {    $result = $result + $item;    return $result;}, 10);用foreach表达:$result = 10;foreach([1, 2, 3] as $v) {    $result = $result + $v;}echo $result;

The effect is the same, but the specific use of the function or foreach faster AH

Reply content:

Array_walk equivalent to foreach:

$arr = ['Client'=>'jQuery','Server'=>'PHP'];array_walk($arr, function($v, $k) {    echo "键:$k 值:$v\n";});

For example, remove the front and back blanks of the array $arr elements:

array_walk($arr, function(&$v) { $v = trim($v); });foreach($arr as &$v) { $v = trim($v); }array_filter: 用回调函数过滤数组中的单元,返回过滤后的数组var_export(    array_filter([1, 2, 3], function($v) {        return $v > 1;    }));和foreach([1, 2, 3] as $k => $v) {    if($v > 1) {        $tmp[$k] = $v;    }}var_export($tmp);都输出:array (  1 => 2,  2 => 3,)

PHP Array Map Simplification (MapReduce):

array_map/array_reducearray_map: 将回调函数作用到给定数组的单元上var_export(    array_map(function ($v) {        return $v * $v;    }, [1, 2, 3]));和foreach([1, 2, 3] as $v) {    $tmp[] = $v * $v;}var_export($tmp);都输出:array (  0 => 1,  1 => 4,  2 => 9,)

Array_reduce: Iterating over the array simplification (reduce) to a single value using a callback function
Output 16, which is 10+1+2+3, where 10 is the initial value.

echo array_reduce([1, 2, 3], function($result, $item) {    $result = $result + $item;    return $result;}, 10);用foreach表达:$result = 10;foreach([1, 2, 3] as $v) {    $result = $result + $v;}echo $result;

The effect is the same, but the specific use of the function or foreach faster AH

