Getting Started with PHP Basics (ii)

Array Processing:
Compact () function: You can put a single variable, multiple variables or even arrays in an array.
$example =array ("A", "B", "C");
$example 2=compact ("D", "E", "example");

Array_combine () function: Merges two arrays into an array, and the values in the preceding array are indexed as values in the subsequent array.
$example =array ("A", "B", "C");
$example 2=array ("AA", "BB", "CC");
$example 3=array ($example, $example 2);

Application of cyclic foreach: a foreach (array name as loop inside an alias called, used to refer to the value inside an algebraic group)
Print_r () is used to display array elements.
Count () is used to calculate the number of array elements
Array_chunk ($ array name, number of partitions in each array, true/false) is used to split the array, true for the original index name, False for the 0-based index name, and the default is false;
Array_merge ($ array name 1,$ array name 2) used to merge arrays

Prev ($ array name) before an array element
Current ($ array name) array element
Next ($ array name) Next array element
End ($ array name) last array element

Sort ($ array name) to sort the values in a group in a forward direction
Rsort ($ array name) to reverse-sort values in a group
Asort ($ array name) sorts the values in a group (the relationship between the key and the value remains the same)
Ksort ($ array name) sorts the keys in the arrays (the relationship between the key and the value remains the same)
Shuffle ($ array name) random sorting of arrays
Array_reverse ($ array name) in reverse order from the original array

Reset ($ array name) resets array
Range (Low,high,step) to create an array
Array_push ($ array name, ' element name ') element can be one or more elements pressed into the element
Array_pop ($ array name) pops up the last element
Array_change_key_case ($ array name, Case_upper) change index to uppercase
ARRAY_INTERSECT_ASSOC ($ array name 1,$ array name 2) array can be multiple, calculate intersection, index also compare Array_intersect ($ array name 1,$ array Name 2) index does not participate in comparison
ARRAY_DIFF_ASSOC ($ array name 1,$ array name 2) array can be multiple, calculate only elements that appear in Array name 1, index also compares Array_diff ($ array name 1,$ array Name 2) index does not participate in comparison
ARRAY_FILP ($ array name) swaps the indexes and values in the array
Array_fill (int $start, int num, ' element ') quickly fills an array element
Array_count_values ($ array name) Number of occurrences of element values in the statistics array
Array_key_exits (index, $ array name) determines whether the index is not the array's
Array_keys ($ array name) lists all indexes in the array array_keys ($ array name, ' value ') to list the index of this value
Array_map ("function name", $ array name) all elements in an array are processed by the function, provided that the function must have parameters
In_array (' element ', $ array name) determines whether an element is inside an array
Key ($ array name) outputs the index of the current element


Regular Expressions: Preg_match ("/Expression/", "string to be captured", $capture)//Capture to a string and populate capture, this capture can be written without writing and returns a Boolean value if not written.

Getting Started with PHP Basics (ii)