PHP array pointer Operation _php Tutorial

Array ("Key" = "value");

Display array

Print_r ($array);

Use the compact () function to create a new array and take the parameters as a unit 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 keys

In_array ($value, $array);//check values in array

※ Get Value

Use Array_values () to get the value of the array

$carValues = Array_values ($car);

Remove the key name of the array

$twoKeys = Array_keys ($two);

Key ($array);//Output The key name of the current cell

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

$red = current ($array);

List ($red, $green) = $array;//assigns 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

※ Traversing an array

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

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

echo "$key = = $value,";//use each to iterate through an array

}

※ Fill Array

padding arrays left and right

Array_pad ($array, +3, "Shuzhi"),//2 parameter is filled from left to right, number is greater than number of cells

$array 1 = Array_fill (5,5, "test");//Use Array_fill () to populate the value of this array with a value of test, starting with the 5th cell and filling 5 cells altogether

Populate array key names

$keys = Array (string, 5, ten, str);

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

Exchange key names and values using the ARRAY_FILP () function

$speed = Array_flip ($speed);

Replace the 6th cell with a value of 7 using the Array_splice () function

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

Use the Array_splice () function to delete an array cell, preserving only the first 5 cells

$output = Array_splice ($input, 5);

$array 1 = range (10,100,10); Use the third parameter of the range () function to set the stepping value between cells

※ Sort

Shuffle ($array);//Disturb the order of the array

Use Array_multisort () to sort three of arrays

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 of an array

Ksort ($array);

Reverse-order using the Krsort () function key Name

Krsort ($array);

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

Sort ($array);

Use Natsort () to sort [natural sort, arrange numerically] to be sensitive to cell value case

Natsort ($array);

Sort by using the Natcasesort () function [natural sort] but ignoring numeric capitalization

Natcasesort ($array);

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

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

※ Intersection, Difference set

Using Array_diff () to calculate the difference set of three arrays [logarithmic group numerical comparison]

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

Use ARRAY_DIFF_ASSOC () to calculate the difference of three arrays [comparison of numeric values and key names]

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

Using Array_diff_key () to calculate the difference of three arrays [comparison key names]

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

Use Array_intersect () to calculate the intersection of three arrays [logarithmic group numeric comparison]

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

Use ARRAY_INTERSECT_ASSOC () to calculate the intersection of three arrays [comparison of numeric and key names]

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

Use Array_intersect_key () to calculate the intersection of three arrays [comparison key name]

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

※ Merging arrays

Merging arrays with the Array_merge () function

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

Array_rand ($input, 10);//random removal of 10 units

Count ($array, count_recursive);//display array unit number, 2 parameter can only be 1 or count_recursive, sometimes can traverse multidimensional array

※ Access Stack

Array out of the stack, LIFO, the last element 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);

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