PHP array pointer operations (php array function summary)

This article introduces the relevant content of pointer operations on arrays in PHP, which is the operation guide for commonly used PHP array functions. Friends in need can refer to it.

php array operation function: 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 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 $ 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 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, keys array_key_exists($key,$array);//Check array keys in_array($value,$array);//Check the value in the array

※Get 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");//Parameter 2 is filled from left to right, and is filled only when the value is greater than the number of cells $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 array key names $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($array); //Use krsort() function to sort by key name in reverse order krsort($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 sort] 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);//Displays 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);