Detailed explanation of array_merge merging arrays in php_PHP tutorial

The array_merge() function merges two or more arrays into one array.

If there are duplicate key names, the key value of the key will be the value corresponding to the last key name (the later one will overwrite the previous one). If the array is numerically indexed, the key names are re-indexed consecutively.

Note: If only an array is input to the array_merge() function, and the keys are integers, the function will return a new array with integer keys, with keys re-indexed starting from 0.

The code is as follows

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代码如下	复制代码
$a=array(3=>"Horse",4=>"Dog"); print_r(array_merge($a)); ?>

$a=array(3=>"Horse",4=>"Dog");

print_r(array_merge($a));

?>

代码如下	复制代码
$face = array("J","Q","K","A"); $numbered = array("2","3","4","5","6","7","8","9"); $cards = array_merge($face, $numbered); shuffle($cards); print_r($cards);

Combine the cells of one or more arrays, and the values ​​in one array are appended to the previous array. Returns the resulting array.

If there is the same string key name in the input array, the value after the key name will overwrite the previous value. However, if the array contains numeric keys, the subsequent values ​​will not overwrite the original values ​​but will be appended to them.

If only an array is given and the array is numerically indexed, the key names are re-indexed in a consecutive manner.

代码如下	复制代码
Array ( [0] => A [1] => 4 [2] => 9 [3] => 3 [4] => K [5] => 7 [6] => 5 [7] => Q [8] => 6 [9] => 8 [10] => 2 [11] => J )

Examples are as follows:

The code is as follows

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$face = array("J","Q","K","A");

$numbered = array("2","3","4","5","6","7","8","9");

$cards = array_merge($face, $numbered);

shuffle($cards);

print_r($cards);

代码如下	复制代码
$array1 = array("AA"=>"A","BB"=>"B","CC"=>"C","DD"=>"D"); $array2 = array("AA"=>"1","BB"=>"2","CC"=>"3","DD"=>"4"); $array3 = array("AA"=>"!","BB"=>"@","CC"=>"#","DD"=>"$"); $arrayX = array_merge($array1, $array2, $array3);     //合并数组 print_r($arrayX); ?>

This will return results as shown below, Append array recursively The array_merge_recursive() function is the same as array_merge(), and can merge two or more arrays together to form a combined array. The difference between the two is that the function will handle it differently when a key in an input array already exists in the result array. array_merge() will overwrite the previously existing key/value pairs and replace them with the key/value pairs in the current input array, while array_merge_recursive() will merge the two values ​​together to form a new array with the original keys. as an array name. There is also a form of array merging, which is to recursively append arrays. Its form is: array array_merge_recursive( array key, array values ​​) An example is as follows:

The code is as follows	Copy code
$array1 = array("AA"=>"A","BB"=>"B","CC"=>"C","DD"=>"D"); $array2 = array("AA"=>"1","BB"=>"2","CC"=>"3","DD"=>"4"); $array3 = array("AA"=>"!","BB"=>"@","CC"=>"#","DD"=>"$"); $arrayX = array_merge($array1, $array2, $array3); //Merge arrays print_r($arrayX); ?>

Concatenate two arrays

The array_combine() function will get a new array, which consists of a set of submitted keys and corresponding values. Its form is:

array array_merge(array array1,array array2[…,array arrayN])

Note that the two input arrays must be of the same size and cannot be empty. An example is as follows:

The code is as follows

代码如下	复制代码
$array1 = array("AA"=>"A","BB"=>"B","CC"=>"C","DD"=>"D"); $array2 = array("AA"=>"1","BB"=>"2","CC"=>"3","DD"=>"4"); $array3 = array("AA"=>"!","BB"=>"@","CC"=>"#","DD"=>"$"); $arrayX = array_merge($array1, $array2, $array3);     //合并数组 print_r($arrayX); ?>

Copy code

$array1 = array("AA"=>"A","BB"=>"B","CC"=>"C","DD"=>"D");
$array2 = array("AA"=>"1","BB"=>"2","CC"=>"3","DD"=>"4");
$array3 = array("AA"=>"!","BB"=>"@","CC"=>"#","DD"=>"$");
$arrayX = array_merge($array1, $array2, $array3); //Merge arrays
print_r($arrayX);
?>

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array_merge() function merges two or more arrays into one array. If there are duplicate key names, the key value of the key will be the value corresponding to the last key name (the later one will overwrite the previous one). If you count...