Pointer operation of php array_PHP tutorial

array("key"=>"value");Create an array

// Display array

print_r($array);

//Use the compact() function to create a new array, and use the parameters as the units of the new array;

$newArray = compact("red","green","yellow","blue","array");

//Use the extract() function to convert the cells in the array into variables

Extract($exArray);

echo "$key1 $key2 $key3 $key4 $key5";

　※Check values ​​and keys

array_key_exists($key,$array);//Check array key

　in_array($value,$array);//Check the value in the array

　※Get the value

//Use array_values() to get the value of the array

　$carValues ​​= array_values($car);

//Get the key name of the array

　$twoKeys = array_keys($two);

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

//After the array is defined, use current() to obtain the value of the current unit

　$red = current($array);

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

　each($two);//Return the key and value of the current unit in the array

　※Traverse the array

　foreach($two as $subArray);//Traverse the array

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

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

　}

　※Fill array

// Fill the array to the left and right

　array_pad($array,+3,"shuzhi");//The 2 parameters are filled from left to right, and will be filled only when the value is greater than the number of units

　$array1 = array_fill(5,5,"test");//Use array_fill() to fill the value of this array, the value is test, start filling from the 5th unit, and fill 5 units in total

// Fill in the array key name

　$keys = array(string, 5, 10, str);

　$array3 = array_fill_keys($keys,"array value");

//Use the array_filp() function to exchange key names and values ​​

　$speed = array_flip($speed);

//Use the array_splice() function to replace the value of the 6th cell with 7

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

//Use the array_splice() function to delete array cells and keep only the first 5 cells

　$output = array_splice($input,5);

$array1 = range(10,100,10); //Use the third parameter of the range() function to set the step value between units

　※Sort

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

//Use array_multisort() to sort three arrays

array_multisort($sort1,$sort2,$sort3);

// Sort this array and maintain the index relationship

asort($array);

// Sort the test array in reverse order and maintain the index relationship

arsort($array);

//Use ksort() to sort the array by key name

ksort($array);

//Use the krsort() function to sort by key name in reverse order

krsort($array);

//Use sort() to sort the test array [arranged by key name]

sort($array);

// Use natsort() to sort [natural sorting, numerical arrangement] which is case-sensitive for unit values ​​

natsort($array);

//Use the natcasesort() function to sort [natural sorting] but ignore the case of values ​​

natcasesort($array);

//Use the array_reverse() function to sort, and the array units are arranged in reverse order

　$newArray = array_reverse($array,TRUE);//Retain the original key name when TRUE is set

　※Intersection and difference

//Use array_diff() to calculate the difference set of three arrays [Compare array values]

$result = array_diff($dog1,$dog2,$dog3);

//Use array_diff_assoc() to calculate the difference set of three arrays [compare values ​​and key names]

$result = array_diff_assoc($dog1,$dog2,$dog3);

//Use array_diff_key() to calculate the difference set of three arrays [Compare key names]

$result = array_diff_key($dog1,$dog2,$dog3);

//Use array_intersect() to calculate the intersection of three arrays [Compare array values]

$result = array_intersect($dog1,$dog2,$dog3);

//Use array_intersect_assoc() to calculate the intersection of three arrays [compare values ​​and key names]

$result = array_intersect_assoc($dog1,$dog2,$dog3);

//Use array_intersect_key() to calculate the intersection of three arrays [Compare key names]

$result = array_intersect_key($dog1,$dog2,$dog3);

　※Merge arrays

//Use the array_merge() function to merge arrays

$result = array_merge($array1,$array2,$array3,$array4,$array5);

array_rand($input,10);//Randomly take out 10 units

Count($array,COUNT_RECURSIVE);//Display the number of array units, the 2 parameters can only be 1 or COUNT_RECURSIVE, sometimes multi-dimensional arrays can be traversed

　※In and out of stack

//The array is popped from the stack, last in first out, and the last unit of the array is popped

array_pop($array);

// Push the array onto the stack and add the two values ​​​​7 and 8 to the end of the array

array_push($array,7,8);

//Move the beginning element of the array out of the array

array_shift($array);

//Add 7 and 8 to the beginning of the array

array_unshift($array,7,8);