PHP learning array

This article will share with you the knowledge of arrays in PHP. Friends in need can refer to it

Arrays are not very simple
int a[1100000]
But PHP is not like this

<?php
    $n=1;    $a=array(array(array()));    $s=array();    $s[1]="S30408";    $a[1][1][1]=0;$a[1][1][2]=1.05;    $a[1][2][1]=0;$a[1][2][2]=2.04;    $a[1][3][1]=7.90;$a[1][3][2]=11.15;    $a[1][4][1]=17.80;$a[1][4][2]=20.20;    $a[1][5][1]=0;$a[1][5][2]=0.09;    $a[1][6][1]=0;$a[1][6][2]=0.055;    $a[1][7][1]=0;$a[1][7][2]=0.035;?>

This is a three-dimensional array, is it a little troublesome?
Let’s start with one-dimensional arrays.

<?php
    $s=array();/*每一个array就是一个维度*/
    $s[1]=100;$s[2]=200;    echo $s[1]+$s[2];?>

This is an array. I have a full arrangement of php

<?php
    $v=array();    $a=array();    function dfs($k){
        global $v,$a,$n;        if($k==$n+1){            for($i=1;$i<n;$i++){                echo $v[$i]," ";
            }            echo $v[$n],"<br>";
        }        else{            for($i=1;$i<=n;$i++){                if($v[$i]==true){                    $v[$i]=false;                    $a[$k]=$i;
                    dfs($k+1);                    $v[$i]=true;
                }
            }
        }
    }
    dfs(5);?>

This is to find the full arrangement of 5.
It seems a little wrong, but don’t be afraid.
Just look at the example
Just connect the two-dimensional one to the very simple one
That’s it

$s=array(array());

That’s it
I will update a chapter tomorrow, what will I talk about?
Let’s talk about some operation loops.

Isn’t an array very simple?
int a[1100000]
But php is not like this

<?php
    $n=1;    $a=array(array(array()));    $s=array();    $s[1]="S30408";    $a[1][1][1]=0;$a[1][1][2]=1.05;    $a[1][2][1]=0;$a[1][2][2]=2.04;    $a[1][3][1]=7.90;$a[1][3][2]=11.15;    $a[1][4][1]=17.80;$a[1][4][2]=20.20;    $a[1][5][1]=0;$a[1][5][2]=0.09;    $a[1][6][1]=0;$a[1][6][2]=0.055;    $a[1][7][1]=0;$a[1][7][2]=0.035;?>

This is a three-dimensional array, is it a little troublesome?
Let’s start with one-dimensional arrays.

<?php
    $s=array();/*每一个array就是一个维度*/
    $s[1]=100;$s[2]=200;    echo $s[1]+$s[2];?>

This is an array. I have a full arrangement of php

<?php
    $v=array();    $a=array();    function dfs($k){
        global $v,$a,$n;        if($k==$n+1){            for($i=1;$i<n;$i++){                echo $v[$i]," ";
            }            echo $v[$n],"<br>";
        }        else{            for($i=1;$i<=n;$i++){                if($v[$i]==true){                    $v[$i]=false;                    $a[$k]=$i;
                    dfs($k+1);                    $v[$i]=true;
                }
            }
        }
    }
    dfs(5);?>

This is to find the full arrangement of 5.
It seems a little wrong, but don’t be afraid.
Just look at the example
Just connect the two-dimensional one to the very simple one
That’s it

$s=array(array());

That’s it
I will update a chapter tomorrow, what will I talk about?
Let’s talk about some operation loops.

Related recommendations:

PHP Learning-WampSever

##PHP Learning-PHP Software Configuration

PHP learning for the first time learning PHP

The above is the detailed content of PHP learning array. For more information, please follow other related articles on the PHP Chinese website!