Pointer operation of PHP array

Array ("Key" => "value");

Display array

Print_r ($array);

Use the compact () function to create a new array and make the argument a cell of the new array;

$newArray = Compact ("Red", "green", "yellow", "Blue", "array");

Use the Extract () function to convert a cell in an array to a variable

Extract ($exArray);

echo "$key 1 $key 2 $key 3 $key 4 $key 5";

※ Check value, key

Array_key_exists ($key, $array);//check array key

In_array ($value, $array);//check value to array

※ Get the value

Use Array_values () to get the value of an array

$carValues = Array_values ($car);

Remove the key name of the array

$twoKeys = Array_keys ($two);

Key ($array);//output keys for current cell

After the array is defined, use current () to get the value of the active cell

$red = current ($array);

List ($red, $green) = $array;//Assign the value in the array to the variable, $array = Array ("Red", "green");

each ($two);//returns the key and value of the current cell in the array

※ Traverse Array

foreach ($two as $subArray);//traversal array

while (the list ($key, $value) = each ($array)) {

echo "$key => $value,";//use each to traverse the array

}

※ Filled Array

Populate the array to the left and right

Array_pad ($array, +3, "Shuzhi");//2 parameter is padding from left to right and the value is larger than the number of cells

$array 1 = Array_fill (5,5, "test");//Use Array_fill () to populate the value of this array, the value is test, start with unit 5th, fill 5 cells

Fill Array Key Name

$keys = Array (' String ', 5, ' str ');

$array 3 = Array_fill_keys ($keys, "array value");

Exchanging key names and values using the ARRAY_FILP () function

$speed = Array_flip ($speed);

Use the Array_splice () function to replace the 6th cell with a value of 7

$output = Array_splice ($input, 6,0,7);

Delete an array cell using the Array_splice () function, leaving only the first 5 cells

$output = Array_splice ($input, 5);

$array 1 = range (10,100,10); Set the step value between cells using the third argument of the range () function

※ Sort

Shuffle ($array);//to disrupt array order

To sort three arrays using Array_multisort ()

Array_multisort ($sort 1, $sort 2, $sort 3);

Sort the array and keep the index relationship

Asort ($array);

Reverse-sort the test array and keep the index relationship

Arsort ($array);

Use Ksort () to sort the key names in the array

Ksort ($array);

Reverse sort using the Krsort () function key Name

Krsort ($array);

Sort the test array by using sort () [Arrange by Key name]

Sort ($array);

Use Natsort () sort [natural sort, in numerical order] for cell value case sensitivity

Natsort ($array);

Use the Natcasesort () function to sort [natural sort] but ignore numeric capitalization

Natcasesort ($array);

Use the Array_reverse () function to sort the array cells in the opposite order

$newArray = Array_reverse ($array, TRUE);//true preserve the original key name when set

※ Intersection, Difference set

Use Array_diff () to compute the difference set of three arrays [array numeric comparison]

$result = Array_diff ($dog 1, $dog 2, $dog 3);

Use ARRAY_DIFF_ASSOC () to compute the difference set for a three array [compare values and key names]

$result = Array_diff_assoc ($dog 1, $dog 2, $dog 3);

Use Array_diff_key () to compute the difference set of three arrays [compare key names]

$result = Array_diff_key ($dog 1, $dog 2, $dog 3);

Use Array_intersect () to compute the intersection of three arrays [array numeric comparisons]

$result = Array_intersect ($dog 1, $dog 2, $dog 3);

Use ARRAY_INTERSECT_ASSOC () to compute the intersection of three arrays [compare values and key names]

$result = Array_intersect_assoc ($dog 1, $dog 2, $dog 3);

Use Array_intersect_key () to compute the intersection of three arrays [compare key names]

$result = Array_intersect_key ($dog 1, $dog 2, $dog 3);

※ Merging arrays

Merging arrays using the Array_merge () function

$result = Array_merge ($array 1, $array 2, $array 3, $array 4, $array 5);

Array_rand ($input, 10);//randomly remove 10 units

Count ($array, count_recursive);//show number of array cells, 2 parameters can only be 1 or count_recursive, sometimes traversing multidimensional arrays

※ Access Stack

Array out of Stack, LIFO, the last cell of the array pops up

Array_pop ($array);

Array into the stack, adding 7, 82 values to the tail of the array

Array_push ($array, 7,8);

Move array start cell to group

Array_shift ($array);

Add 7, 8 to the beginning of the array

Array_unshift ($array, 7,8);