International trade practice case analysis Example analysis of commonly used array processing methods in PHP

1.array_shift() moves the first unit of the array out and then returns it. This is very convenient for sometimes the first unit of the array needs to be processed separately.

Copy the code The code is as follows:

$tmparray = array("1", "2", "3", "4");
$tmparray = array_shift ($tmparray);
print_r($tmparray);
?>

2.array_chunk() splits an array into multiple arrays, and the following parameters control the number of array units.

Copy the code The code is as follows:

$tmparray = array('a', 'b', 'c', 'd', 'e');
print_r(array_chunk($ tmparray, 2));
?>

This function is very useful in some loops. For example, I want to put the obtained data into N rows and M columns. It will definitely not work if we loop directly. Of course, we can use nested loops to achieve it, but it is too troublesome. It would be very convenient if we use the array_chunk() function to process it first and then return the new array.
3.array_push() pushes the passed in value to the end of the array.

Copy code The code is as follows:

$tmparray = array ("a", "b");
array_push ($tmparray, "c", "d");
print_r( $tmparray);//Array([0] => a[1] =>b[2] =>c[3] =>d)
?>

4.array_unshift() will The incoming unit is inserted into the array as a whole

Copy the code The code is as follows:

$tmparray= array ("a", "b");
$resarray = array_unshift ($tmparray , "c", "d");
print_r($resarray )//Array([0] => a[1] =>b[2] =>c[3] =>d)
?>

5.array_unique deduplicates the array and returns a new array

Copy the code The code is as follows:

$tmparray = ("a" => "a ","b" => "b","c" => "c","d" => "b");
$resarray = array_unique($tmparray);//("a" = > "a","b" => "b","c" => "c");
?>

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