PHP Array_merge merging two arrays program _php tutorial

Merging data in PHP we use the Array_merge () function to implement the Array_merge () function to combine two or more arrays into an array. If the key name is duplicated, the key's key value is the value corresponding to the last key name (followed by overwriting the previous one). If the array is a numeric index, the key name is re-indexed in a sequential manner.

The code is as follows

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echo "RN The first case of Rn"; $a =array (1,2,3,4,5,6); $b =array (7,8,9); $c =array_merge ($a, $b); Print_r ($c); $c = $a + $b; Print_r ($c); $c = $b + $a; Print_r ($c); echo "RN The second case of Rn"; $a =array (' A ', ' B ', ' C ', ' d ', ' e ', ' f '); $b =array (' A ', ' x ', ' Y '); $c =array_merge ($a, $b); Print_r ($c); $c = $a + $b; Print_r ($c); $c = $b + $a; Print_r ($c); echo "RN The third case of Rn"; $a =array ( 1=> ' A ', 2=> ' B ', 3=> ' C ', 4=> ' d ', 5=> ' E ', 6=> ' F '); $b =array ( 1=> ' A ', 7=> ' x ', 8=> ' y '); $c =array_merge ($a, $b); Print_r ($c); $c = $a + $b; Print_r ($c); $c = $b + $a; Print_r ($c); ?> The results are as follows: First case Array ( [0] = 1 [1] = 2 [2] = 3 [3] = 4 [4] = 5 [5] = 6 [6] = 7 [7] = 8 [8] = 9 ) Array ( [0] = 1 [1] = 2 [2] = 3 [3] = 4 [4] = 5 [5] = 6 ) Array ( [0] = 7 [1] = 8 [2] = 9 [3] = 4 [4] = 5 [5] = 6 ) The second case Array ( [0] = a [1] = b [2] = C [3] = d [4] = = E [5] = f [6] = a [7] = X [8] = y ) Array ( [0] = a [1] = b [2] = C [3] = d [4] = = E [5] = f ) Array ( [0] = a [1] = X [2] = y [3] = d [4] = = E [5] = f ) The third case Array ( [0] = a [1] = b [2] = C [3] = d [4] = = E [5] = f [6] = a [7] = X [8] = y ) Array ( [1] = a [2] = b [3] = C [4] = d [5] = = E [6] = f [7] = X [8] = y ) Array ( [1] = a [7] = X [8] = y [2] = b [3] = C [4] = d [5] = = E [6] = f ) 1) Key Name

As a number, array_merge () does not overwrite the original value, but the + merge array will return the first occurrence as the final result, and the values of the following array with the same key name "Discard" (not overwrite)

2) When the key name is a character, + still returns the first occurrence as the final result, and discards the value of the following array with the same key name, but Array_merge () overwrites the previous value of the same key name

Note: If you only enter an array into the Array_merge () function and the key name is an integer, the function returns a new array with an integer key name, with the key name re-indexed starting at 0

http://www.bkjia.com/PHPjc/628937.html www.bkjia.com true http://www.bkjia.com/PHPjc/628937.html techarticle merging data in PHP we use the Array_merge () function to implement the Array_merge () function to combine two or more arrays into an array. If the key name is duplicated, the key value is the last ...

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