How to implement format conversion of PHP arrays

Today we will discuss the array conversion problem of PHP. PHP has powerful data processing capabilities, among which arrays are the most widely used data type. In actual development, we often encounter situations where we need to convert array formats, such as converting a two-dimensional array into a one-dimensional array, converting an associative array into a normal array, etc. So how to implement format conversion of PHP arrays?

1. Convert a two-dimensional array to a one-dimensional array

If you want to convert a two-dimensional array into a one-dimensional array, we can use the array_column() function in PHP. The specific steps are as follows:

1. Define a two-dimensional array, for example:

$arr = array(
    array('id'=>1,'name'=>'Tom','age'=>18),
    array('id'=>2,'name'=>'Jerry','age'=>20),
    array('id'=>3,'name'=>'Mike','age'=>22)
);

2. Use the array_column() function to convert the two-dimensional array into a one-dimensional array:

$result = array_column($arr, 'name', 'id');

The result obtained at this time is:

array (
  1 => 'Tom',
  2 => 'Jerry',
  3 => 'Mike',
)

The second parameter 'name' represents the column to be obtained, which is a string type key name; the third parameter 'id' is optional , indicating the column to be used as the key name of the returned array, which is also a string type key name.

2. Convert an ordinary array to an associative array

We can convert an ordinary array into an associative array by looping through the ordinary array and assigning key-value pairs to it. The specific operations are as follows:

1. Define an ordinary array, for example:

$arr = array('apple','banana','orange');

2. Loop through the array and assign values:

$newArr = array();
foreach ($arr as $key=>$value) {
    $newArr[$key] = $value;
}

The result obtained at this time is:

array (
  0 => 'apple',
  1 => 'banana',
  2 => 'orange',
)

3. Convert associative array to ordinary array

Convert associative array to ordinary array, that is, remove the key name of the array. We can use the array_values() function in PHP to achieve this. The specific operations are as follows:

1. Define an associative array, for example:

$arr = array('name'=>'Tom','age'=>18,'gender'=>'male');

2. Use the array_values() function to remove the key name of the associative array:

$newArr = array_values($arr);

At this time The result obtained is:

array (
  0 => 'Tom',
  1 => 18,
  2 => 'male',
)

Summary:

The above is the specific operation method of PHP array conversion. Through the array_column() function, array loop, array_values() function, etc., we can make it very convenient Implement format conversion of arrays. It is worth noting that when performing array conversion, we need to pay attention to the structure and type of the array to avoid errors. I hope this article will be helpful to everyone learning PHP arrays.

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