PHP common array application instructions (1/2)_PHP tutorial

ange($low, $high),range($low, $high, $step);//Create an array of sequential values ​​such as: range(1,4) is (1,2,3, 4) Another example is range('a','z')

each($array) returns the current element of the array in order, and sets the next element as the current element;

reset($array) resets the current element of the array to the beginning of the array

list() can be used to decompose an array into a series of values, such as list($a,$b)=each($array)

shuffle($array),array_rand($arg, $num_req); Randomly sort the array

array_reverse($input),array_reverse($input, $preserve_keys) Returns the reverse sorting of the original array

sort($array); Sort the array

PHP Tutorial Array is an important concept. It contains a large number of functions to facilitate people's development... Its arrays are now classified to facilitate query and application.
Let’s talk about the definition of PHP array first... PHP array contains two items, key and value. The corresponding value can be obtained through key, where key can be numerical and associated, such as $array[0], $array[one] …
Create array
The array declaration in PHP is slightly different from that in other languages, but it can still be declared as one-dimensional, two-dimensional, three-dimensional and multi-dimensional, such as
$array[0] = 1,$array = array(1,2,3); One-dimensional array, including only three values, is a numerical array. When referencing, $array[0] can be used to represent 1 to create a numerical array. The index can be omitted.

$array = array(
1 => “one”,
2 => “two”,
3 => “three”,
4 => array(
“one” => 1,
“two” => 2,
“three” => 3
)
);

A two-dimensional array, which is also an associative array, can be referenced by $array[4]["one"] to represent 1.
And so on for three dimensions and above...
If you want to create arrays in batches, you can use the following function:
array range (mixed low, mixed high [, number step] )
For example, $array = range(1,6); represents array(1,2,3,4,5,6);
$array = range(a,f); represents array(a,b,c,d,e,f);

Output array
There are many functions for outputting arrays in php, the commonly used ones are
bool print_r ( mixed expression [, bool return] )
void var_dump ( mixed expression [, mixed expression [, ...]] )
There are also things like echo, print, and printf that can output a single array.

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http://www.bkjia.com/PHPjc/631343.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/631343.htmlTechArticleange($low, $high),range($low, $high, $step);//Create An array of sequential values ​​such as: range(1,4) is (1,2,3,4) and range('a','z') each($array) returns the current elements of the array in order, and the next A...