PHP数组操作汇总

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。

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 $... ] )。

<?PHP $number = "1,3,5,7,9"; $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。

Array ( [number] => 1,3,5,7,9 [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 )

<?PHP $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：

<?PHP $array1 = range(0,100,10);//0为起始值，100为结束值，10为步进值(默认步进值为1). print_r($array1); echo"<br />"; $array2 = range("A","Z"); print_r($array2); echo "<br />"; $array3 = range("z","a"); print_r($array3); ?>

array_fill()

array_fill()函数——填充数组函数：

<?PHP $array = range(1,10); $fillarray = range("a","d"); $arrayFilled = array_fill(0,5,$fillarray);//这里的$fillarray可以是字符串，如"test". echo "<pre>"; print_r ($arrayFilled); echo "</pre>"; $keys = array("string","2",9,"SDK","PK"); $array2 = array_fill_keys($keys,"testing"); echo "<pre>"; print_r ($array2); echo "</pre>"; ?> 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 )