PHP Notes: Php function range () round () and list () Instructions _php Tutorial

A >>

The range () function quickly creates an array of simple methods, populates the array with an integer value of low to high, and the function returns an array containing all the integers in the sub-range. The form is as follows

Array range (int low,int high[,int Step])

Typical usage is as follows

Example: Creating an array of 1-6 6 numbers (DICE)

$die = range (0,6);

Create 0-30 arrays of all even-numbered

$even = (0,20,2);//step is 2

This function can be used not only as a number, but also as a letter.

Such as

$words = Range (' A ', ' Z ');

An array of all the letters that contain a through Z is created. This can be used to generate Authenticode functions.

b >>

Round () function

This function is afraid to confuse me. This function is a huge difference from which range above.

The purpose of this function is to

The accuracy of the floating-point number

Float round (float var[,int preisin})

Typical usage

Example: $pi = 3.141592653;

Round ($PI, 4);

Echo $pi;

Will output 3.1415

Three >>

List () function

The list () function extracts multiple values from an array in a single operation. Assign a value to the variable at the same time. The form is as follows

void list (mixed)

Typical usage

复制代码 代码如下: $info = array('coffee', 'brown', 'caffeine'); // Listing all the variables list($drink, $color, $power) = $info; echo "$drink is $color and $power makes it special.\n"; // Listing some of them list($drink, , $power) = $info; echo "$drink has $power.\n"; // Or let's skip to only the third one list( , , $power) = $info; echo "I need $power!\n"; ?>

上例摘自PHP手册 可以用list()配合正则来切割字符串存入变量表 典型用法 list($name,$occupation,$color) = exolode("|",$line);


http://www.bkjia.com/PHPjc/326968.html www.bkjia.com true http://www.bkjia.com/PHPjc/326968.html techarticle a range () function is a simple way to quickly create an array, populating an array with an integer value of low to high, and the function returns an array that contains all the integers in the sub-range. Form the following array ra ...

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