PHP array inserts elements at any position and deletes instance details of specific elements

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is as follows:

$ary = array(
  array('t'=>1,'y'=>2),
  array('t'=>2,'y'=>9)
);
$t = array_splice(
  $ary, 1,0,array(array('t'=>3,'y'=>10))
);

print_r($ary);

Control Station output:

$ary = array(

  array('t'=>1,'y'=>2),

  array('t'=>3,'y'=>10),


  array('t'=>2,'y'=>9)
);

Briefly introduce the array_splice method. The first parameter is the array being operated on, the second parameter is the index value of the operating element, and the third parameter is is the length, parameter four is the element to be replaced. The effect of this method is to delete the consecutive elements in the parameter array with parameter two as the starting position and length parameter three, and then fill them with parameter four.

If the length is 0, the effect is equivalent to inserting the specified element at the specified index value.

If the length is 1, the effect is equivalent to removing the element with the index value

$ary = array(
  array('t'=>1,'y'=>2),
);

Deleting specific elements in the array

$arr1 = array(1,3, 5,7,8);

$key = array_search(3, $arr1);

if ($key !== false){

  array_splice($arr1, $key, 1);

}

var_dump($arr1);

Output: array(1, 5,7,8);

array_slice(array,start,length,preserve)

From the array The start element starts to be taken out and the remaining elements in the array are returned

$a=array("red","green","blue","yellow","brown");
print_r(array_slice($a,2));

Output array("blue","yellow","brown")

array_push

array_push -- Push one or more cells to the end of the array (push)

Description

int array_push ( array &array, mixed var [, mixed ...] )

array_push() treats array as a stack and pushes the passed variable into the end of array. The length of array will increase according to the number of variables pushed onto the stack.

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