php数组内的数据分类,php中数组的定义有几种

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PHP如何高效地对根据键值对数组元素进行归类

?phpfunction filter($elem){ return $elem['type'] == '空调';}$arr=Array( Array('id' = 1,'type' = '空调'), Array('id' = 2,'type' = '电视机'), Array('id' = 3,'type' = '空调'));$newarr = array_filter($arr, 'filter');print_r($newarr);exit;

相关问答

Q1: 如何实现PHP根据数组的值进行分组

PHP根据数组的值分组，php array中没有自带这个函数但是很常用

代码：

$_array = array(

array(1,11,'2016-05-18'),

array(2,11,'2016-05-18'),

array(3,22,'2016-05-18'),

array(4,22,'2016-05-18'),

array(5,33,'2016-05-19'),

array(6,33,'2016-05-19'),

array(7,44,'2016-05-19'),

array(8,44,'2016-05-19'),

array(9,55,'2016-05-20'),

array(10,55,'2016-05-20'),

);

var_dump(array_val_chunk($_array));

function array_val_chunk($array){

$result = array();

foreach ($array as $key = $value) {

$result[$value[1].$value[2]][] = $value;

}

$ret = array();

//这里把简直转成了数字的，方便同意处理

foreach ($result as $key = $value) {

array_push($ret, $value);

}

return $ret;

}

运行结果如下：

array(5) {

[0]=

array(2) {

[0]=

array(3) {

[0]=

int(1)

[1]=

int(11)

[2]=

string(10) "2016-05-18"

}

[1]=

array(3) {

[0]=

int(2)

[1]=

int(11)

[2]=

string(10) "2016-05-18"

}

[1]=

array(2) {

[0]=

array(3) {

[0]=

int(3)

[1]=

int(22)

[2]=

string(10) "2016-05-18"

}

[1]=

array(3) {

[0]=

int(4)

[1]=

int(22)

[2]=

string(10) "2016-05-18"

}

[2]=

array(2) {

[0]=

array(3) {

[0]=

int(5)

[1]=

int(33)

[2]=

string(10) "2016-05-19"

}

[1]=

array(3) {

[0]=

int(6)

[1]=

int(33)

[2]=

string(10) "2016-05-19"

}

[3]=

array(2) {

[0]=

array(3) {

[0]=

int(7)

[1]=

int(44)

[2]=

string(10) "2016-05-19"

}

[1]=

array(3) {

[0]=

int(8)

[1]=

int(44)

[2]=

string(10) "2016-05-19"

}

[4]=

array(2) {

[0]=

array(3) {

[0]=

int(9)

[1]=

int(55)

[2]=

string(10) "2016-05-20"

}

[1]=

array(3) {

[0]=

int(10)

[1]=

int(55)

[2]=

string(10) "2016-05-20"

}

Q2: php 分割数组数据

str_split函数能实现你这样的功能，把字符串按长度分割为数组，例如：

?php

$str = "Hello Friend";

$arr1 = str_split($str);

$arr2 = str_split($str, 3);

print_r($arr1);

print_r($arr2);

代码输出的结果如下：

Array

(

[0] = H

[1] = e

[2] = l

[3] = l

[4] = o

[5] =

[6] = F

[7] = r

[8] = i

[9] = e

[10] = n

[11] = d

)

Array

(

[0] = Hel

[1] = lo

[2] = Fri

[3] = end

)

Q3: php 把数组按条件分成不同的数组

$arr1 = array("In/4833895_0001.jpg","In/4834113_0002.jpg","Out/4834223_0001.jpg","In/4834301_0003.jpg","Out/4834442_0002.jpg","In/4834520_0004.jpg","Out/4834598_0003.jpg","In/4834723_0005.jpg","Out/4834817_0004.jpg","In/4834863_0006.jpg","Out/4835004_0005.jpg","In/4835067_0007.jpg","Out/4835254_0006.jpg","Out/4835410_0007.jpg","Out/04835629_0008.jpg","Out/4835785_0009.jpg");

foreach($arr1 as $k = $val){

if(strpos($val,"In")===0){

$inArr[] = $val;

}else{

$outArr[] = $val;

}

print_r($inArr);

echo "br";

print_r($outArr);

Array

(

[0] = In/4833895_0001.jpg