PHP takes the first element of the array and deletes the array instance_PHP tutorial

In PHP, array is a very special array type that can store various types of data. Below I will introduce some examples of reading and deleting specified array elements from the array.

array: array

offset: Specifies the starting position of the element to be retrieved. If it is a positive number, it is taken from the front to the back. If it is a negative value, the offset absolute value is taken from the back to the front.

1. PHP gets the first element of the index array

It is very easy to get the first element of the index array. Just write 0 as the subscript. No explanation required.

The focus is to share with you how to get the first item in an associative array in PHP. First put the code I wrote today:

The code is as follows

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//Take the default first channel name

代码如下	复制代码
//取默认第一个渠道名 $channel_arr = $this->get_from_channel();  //所有渠道数组 $arr_num = count($channel_arr); $first_channel = array_slice($channel_arr,0,-($arr_num-1));  //取渠道数组第一个 $html['from_channel'] = $first_channel[0];

$channel_arr = $this->get_from_channel(); //All channel arrays

$arr_num = count($channel_arr);
$first_channel = array_slice($channel_arr,0,-($arr_num-1)); //Get the first one in the channel array $html['from_channel'] = $first_channel[0];

Delete array

代码如下	复制代码
$a=array(0=>"Dog",1=>"Cat",2=>"Horse",3=>"Bird"); print_r(array_slice($a,1,2)); ?> 输出 Array ( [0] => Cat [1] => Horse )

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$a=array(0=>"Dog",1=>"Cat",2=>"Horse",3=>"Bird"); print_r(array_slice($a,1,2));

?>

代码如下	复制代码
$array = array('1', '2', '3', '4', '5'); $del_value = 3; unset($array[array_search($del_value , $array)]);//利用unset删除这个元素 print_r($array); 输出 array('1', '2', '4', '5');

Output

Array ( [0] => Cat [1] => Horse )

There is also the array_shift() function that deletes the first element in the array and returns the value of the deleted element.

The relative array_pop() function deletes the last element in the array.

代码如下	复制代码
unset($array[3]); unset($array['foo']);

After using several functions, array_search() is more practical

The array_search() function is the same as in_array(), searching for a key value in the array. If the value is found, the key of the matching element is returned. If not found, return false

代码如下	复制代码
unset($array[3] $array[5]); unset($array['foo'] $array['bar']);

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$array = array('1', '2', '3', '4', '5'); $del_value = 3; unset($array[array_search($del_value, $array)]);//Use unset to delete this element print_r($array); Output array('1', '2', '4', '5');

Delete an element in an array in PHP There are several ways to delete array elements in PHP: To delete an element, use onset()

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unset($array[3]); unset($array['foo']);

To delete multiple discontinuous elements, also use unset()

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unset($array[3] $array[5]); unset($array['foo'] $array['bar']);

To delete multiple consecutive elements, use array_splice()

The code is as follows

代码如下	复制代码
array_splice($array $offset $length);

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array_splice($array $offset $length);

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In php, array is a very special array type that can store various types of data. Let me introduce it below Some instances of reading and deleting specified array elements from an array. array: array off...