How to intercept an array using PHP

With the rapid development of the Internet, the PHP programming language has become one of the commonly used programming languages ​​​​in network development. In the PHP programming language, arrays are a very common data type, and many developers will also encounter situations where they need to intercept arrays. This article will introduce how to use PHP to intercept an array.

1. Use the array_slice() function to intercept the array

The array_slice() function is PHP’s built-in interception array function, which can be used to extract a certain part of the array and return a new array. This function can receive three parameters:

array_slice(array,start,length,preserve_keys);

Parameter description:

array: Required, specifies the array to be intercepted.

start: Required, specifies which element to start intercepting. If it is a positive number, it starts from the beginning of the array. If it is a negative number, it is counted from the end of the array.

length: Optional, specifies how many elements to return. If omitted, the function returns all remaining elements.

preserve_keys: Optional, specifies whether to preserve the key name of the array. This parameter defaults to false, which means that the key names of the array are not retained.

Sample code:

$arr ​​= array("a","b","c","d","e");
$result = array_slice($ arr,2,3);
print_r($result);

Output result:

Array ( [0] => c [1] => d [2] => e )

Code explanation: The $arr array is the source array, and the $result array is a new array composed of three elements intercepted from the third element in the source array.

2. Use the array_splice() function to cut the array

The array_splice() function is PHP’s built-in array cutting function, which is used to cut a part of the array and replace it with a new element. . This function can receive three parameters:

array_splice(array,start,length,array2);

Parameter description:

array: required, specifies the array to be cut .

start: Required, specifies which element to start cutting from. If it is a positive number, it starts from the beginning of the array. If it is a negative number, it is counted from the end of the array.

length: Optional, specifies how many elements to cut. If omitted, the function cuts all elements from the element specified by start to and including the end of the array.

array2: Optional, specifies the new element used to replace the cut part. The parameter can be an array or a value.

Sample code:

$arr ​​= array("a","b","c","d","e");
array_splice($arr,2 ,3,array("x","y","z"));
print_r($arr);

Output result:

Array ( [0] => ; a [1] => b [2] => Element starts cutting three elements and replacing them with three elements "x", "y", "z", and the resulting new array is ["a", "b", "x", "y", "z"].

3. Use the array_chunk() function to cut the array

The array_chunk() function is PHP’s built-in cutting array function, which is used to divide an array into a specified number of array blocks. This function can receive two parameters:

array_chunk(array,size,preserve_keys);

Parameter description:

array: Required, specifies the array to be cut.

size: Required, specifies the size of each new array block.

preserve_keys: Optional, specifies whether to preserve the key name of the array. This parameter defaults to false, which means that the key names of the array are not retained.

Sample code:

$arr ​​= array("a","b","c","d","e");

$result = array_chunk($ arr,2);

print_r($result);

Output result:

Array ( [0] => Array ( [0] => a [1] = > b ) [1] => Array ( [0] => c [1] => d ) [2] => Array ( [0] => e ) )

Code explanation: $arr is the source array, divide it into array blocks of size 2, and get the cut array $result.

Summary

Intercepting, shearing and cutting arrays are common operations in PHP programming. These operations can be easily implemented using the functions introduced above. At the same time, when writing code, pay attention to the order and usage of parameters to avoid errors.

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