PHP数组操作及遍历实例大全
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对于Web编程来说，最重要的就是存取和读写数据了。存储方式可能有很多种，可以是字符串、数组、文件的形式等。数组，可以说是PHP的数据应用中较重要的一种方式。PHP的数组函数众多，下面是我学习的小结，借此记之，便于以后鉴之。 1. 数组定义 数组的定义使用 array()方式定义，可以定义空数组： $number = array(1,3,5,7,9); //定义空数组 $result = array(); $color =array("red","blue","green"); //自定义键值 $language = (1=>"English",3=>"Chinese",5=>"Franch"); //定义二维数组 $two = array( "color"=>array("red","blue"),//用逗号结尾 "week"=>array("Monday","Friday") //最后一句没有标点 )； ?> 2. 创建数组 compact() compact()函数——将一个或多个变量（包含数组）转换为数组：array compact ( mixed $varname [,mixed $... ] )。 $number = "1,9"; $string = "I'm PHPer"; $array = array("And","You?"); $newArray = compact("number","string","array"); print_r ($newArray); ?> compact()函数用于将两个或多个变量转换为数组，当然也包含数组变量。其参数是变量的名称而非带有$全名。相反的函数是extract()作用顾名思义就是将数组转换为单个的字符串，键值作为其字符串名称，数组值作为字符串的值。 运行结果: Array ( [number] => 1,9 [string] => I'm PHPer [array] => Array ( [0] => And [1] => You? ) ) array_combine() array_combine()——将两个数组重组成一个数组,一个作键值一个做的值：array array_combine ( array $keys,array $values ) $number = array("1","3","5","7","9"); $array = array("I","Am","A","PHP","er"); $newArray = array_combine($number,$array); print_r ($newArray); ?> array_combine函数不多说了，谁看了都明白。 运行结果： Array ( [1] => I [3] => Am [5] => A [7] => PHP [9] => er ) range() range()函数——创建指定范围的数组： $array1 = range(0,100,10);//0为起始值，100为结束值，10为步进值(默认步进值为1). print_r($array1); echo" $array2 = range("A","Z"); print_r($array2); echo " $array3 = range("z","a"); print_r($array3); ?> array_fill() array_fill()函数——填充数组函数： $array = range(1,10); $fillarray = range("a","d"); $arrayFilled = array_fill(0,$fillarray);//这里的$fillarray可以是字符串，如"test". echo " ";"; $keys = array("string","2",9,"SDK","PK"); $array2 = array_fill_keys($keys,"testing"); echo " ";"; ?> 运行结果： Array ( [0] => Array ( [0] => a [1] => b [2] => c [3] => d ) [1] => Array ( [0] => a [1] => b [2] => c [3] => d ) [2] => Array ( [0] => a [1] => b [2] => c [3] => d ) [3] => Array ( [0] => a [1] => b [2] => c [3] => d ) [4] => Array ( [0] => a [1] => b [2] => c [3] => d ) ) Array ( [string] => testing [2] => testing [9] => testing [SDK] => testing [PK] => testing ) 3. 数组的遍历 foreach遍历 foreach (array_expression as $value){} foreach (array_expression as $key => $value){} $speed = array(50,120,180,240,380); foreach($speed as $keys=>$values){ echo $keys."=>".$values." } ?> while循环遍历 while循环遍历一般结合list函数，以下是实例 $staff = array( array("姓名","性别","年龄"), array("小张","男",24), array("小王","女",25), array("小李",23) ); echo " 相关内容
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