Convert values ​​in php array to array

During the PHP development process, we often encounter situations where we need to convert the values ​​in the array into an array again. For example, in the parameters of the request, there may be multiple values ​​corresponding to the same parameter name. In this case, we need to convert these values ​​into an array for processing. Here are several ways to convert values ​​in PHP arrays into arrays.

Method 1: explode() function

First, you can use the explode() function in PHP to convert the string into an array, as shown below:

$str = "apple,banana,orange";
$arr = explode(",", $str);
print_r($arr);

This way You can convert a comma-separated string into an array, and the output result is:

Array
(
    [0] => apple
    [1] => banana
    [2] => orange
)

However, if the values ​​in the array are already arrays, using the explode() function will convert each value into an element of the array. leading to incorrect results. Therefore, this method only works when all the values ​​in the array are strings.

Method 2: array_map() function

You can use the array_map() function in PHP combined with an anonymous function to convert the values ​​in the array into an array. The code is as follows:

$arr = array("1,2,3", "4,5,6", "7,8,9");
$arr = array_map(function($item) {
    return explode(",", $item);
}, $arr);
print_r($arr);

In this way, all strings separated by specified characters in the array can be converted into subarrays. The output result is as follows:

Array
(
    [0] => Array
        (
            [0] => 1
            [1] => 2
            [2] => 3
        )

    [1] => Array
        (
            [0] => 4
            [1] => 5
            [2] => 6
        )

    [2] => Array
        (
            [0] => 7
            [1] => 8
            [2] => 9
        )

)

Method 3: json_decode() function

Finally, you can use the json_decode() function in PHP to convert the JSON format string into an array. The code is as follows:

$json_str = '["apple","banana","orange"]';
$arr = json_decode($json_str, true);
print_r($arr);

This way you can convert a JSON format string into an array. The output result is as follows:

Array
(
    [0] => apple
    [1] => banana
    [2] => orange
)

Of course, if the values ​​in the array are already JSON-formatted strings, you can also use this method for conversion.

Summary

Through the above method, the values ​​in the PHP array can be converted into an array for the next step of processing. However, it should be noted that if the value in the array is already an array, do not use the above method to convert again, otherwise you will get wrong results.

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