What does ul mean in php

ul function is used to convert a multi-dimensional array into a one-dimensional array. The syntax is array ul(array $array). It returns a one-dimensional array containing all elements in a multi-dimensional array. It should be noted that the ul function will only flatten into the top-level array and will not recursively flatten multi-dimensional arrays. It also does not modify the original array, but returns a new array.

ul in PHP

What is ul?

ul is a function in PHP that converts a multidimensional array into a one-dimensional array.

How to use the ul function?

Syntax:

<code class="php">array ul(array $array)</code>

Where:

• $array is the multidimensional array to be converted to a one-dimensional array.

Return result:

ul function returns a one-dimensional array that contains all elements in the multi-dimensional array.

Example:

<code class="php">$multiArray = array(
    array(1, 2, 3),
    array(4, 5, 6),
    array(7, 8, 9)
);

$flatArray = ul($multiArray);

print_r($flatArray); // 输出：Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 [6] => 7 [7] => 8 [8] => 9 )</code>

Note: The

• ul function does not recursively flatten multidimensional arrays. It only flattens the top level array.
• ul function does not modify the original array. It returns a new one-dimensional array.

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