PHP and MySQL Web development notes--the 3rd chapter uses arrays

you can use = to copy an array into another array.

Range (): Used to generate an arithmetic progression array.

$arr [0]= "Hello";//create an array of length 1, equivalent to $arr = Array ("0" = "Hello"); $arr [1]= "World"; $arr 2 = array ("Hello", "World");//equivalent to the above two lines of code foreach ( $arr as $now )//foreach Loop { echo $now. " "; } foreach ( $arr as $key + $value ) { echo $key. ":" $value. " "; } reset ($arr);//reset pointer //each function while ($ Element=each ($arr)) { echo $element [' key ']. ': ' $element [' value ']. " 1 "; } //Use list for loop reset ($arr); while (list ($key, $v) =each ($arr)) { echo $key. ":" $v. " "; }

$arr 1+ $arr 2: Add the latter element to the back of the former, and key will not be added or overwritten.

Array sorting:

Sort (), Rsort (): Ascending, descending

Asort (), Arsort (): Sorting values

Ksort (), Krsort (): Key sort

Usort (), Uasort (), Uksort (): Custom comparison rules, custom comparison functions required

Other operations of the array:

Current (): Returns the element that is currently pointer, alias POS ()

Reset (), End (): pointer pointing to First, tail

Next (), prev (): Remove one/previous element

Shuffle (): random element that modifies the original array

Array_reverse (): Array in reverse order, the original array does not change

Array_work (): callback processing for each element in the array using a user-defined function

Count (), sizeof (): Calculates the array length

Array_count_values (): Statistical frequency of values

Extract (): Converts an array to a scalar form

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