本文给大家汇总了16个常见的php基本函数，涵盖的面很广，这里推荐给大家，希望对大家学习php能够有所帮助。
1.统计数组元素个数
$arr = array('1011,1003,1008,1001,1000,1004,1012','1009','1011,1003,1111' );$result = array();foreach ($arr as $str) { $str_arr = explode(',', $str); foreach ($str_arr as $v) { // $result[$v] = isset($result[$v]) ? $result[$v] : 0; // $result[$v] = $result[$v] + 1; $result[$v] = isset($result[$v]) ? $result[$v]+1 : 1; }}print_r($result);//array([1011] => 2[1003] => 2[1008] => 1[1001] => 1[1000] => 1[1004] => 1[1012] => 1[1009] => 1[1111] => 1)
2. 循环删除目录
function cleanup_directory($dir) { foreach (new directoryiterator($dir) as $file) { if ($file->isdir()) {if (! $file->isdot()) {cleanup_directory($file->getpathname());} } else {unlink($file->getpathname()); } } rmdir($dir);}
3.无限极分类生成树
function generatetree($items){ $tree = array(); foreach($items as $item){if(isset($items[$item['pid']])){$items[$item['pid']]['son'][] = &$items[$item['id']];}else{$tree[] = &$items[$item['id']];} } return $tree;}function generatetree2($items){ foreach($items as $item)$items[$item['pid']]['son'][$item['id']] = &$items[$item['id']]; return isset($items[0]['son']) ? $items[0]['son'] : array();}$items = array( 1 => array('id' => 1, 'pid' => 0, 'name' => '安徽省'), 2 => array('id' => 2, 'pid' => 0, 'name' => '浙江省'), 3 => array('id' => 3, 'pid' => 1, 'name' => '合肥市'), 4 => array('id' => 4, 'pid' => 3, 'name' => '长丰县'), 5 => array('id' => 5, 'pid' => 1, 'name' => '安庆市'),);print_r(generatetree($items));/** * 如何取数据格式化的树形数据 */$tree = generatetree($items);function gettreedata($tree){ foreach($tree as $t){echo $t['name'].'
';if(isset($t['son'])){gettreedata($t['son']);} }}
4.数组排序 a - b 是数字数组写法 遇到字符串的时候就要
var test = ['ab', 'ac', 'bd', 'bc'];test.sort(function(a, b) { if(a b) {return 1; }return 0;});
5.array_reduce
$raw = [1,2,3,4,5,];// array_reduce 的第三个参数是 $result 的初始值array_reduce($raw, function($result, $value) { $result[$value] = $value;return $result;}, []);// [1 => 1, 2 => 2, ... 5 => 5]
6.array_map 闭包中只接受一个或者多个参数，闭包的参数数量和 array_map 本身的参数数量必须一致
$input = ['key' => 'value'];array_map(function($key, $value) {echo $key . $value;}, array_keys($input), $input)// 'keyvalue'$double = function($item) { return 2 * $item;}$result = array_map($double, [1,2,3]);// 2 4 6
7.繁殖兔子
$month = 12; $fab = array();$fab[0] = 1; $fab[1] = 1;for ($i = 2; $i ;}
8 .datetime
function getcurmonthfirstday($date){ return date('y-m-01', strtotime($date));} getcurmonthlastday('2015-07-23')function getcurmonthlastday($date){ return date('y-m-d', strtotime(date('y-m-01', strtotime($date)) . ' +1 month -1 day'));}
9.加密解密
function encrypt($data, $key){ $key = md5($key); $x = 0; $len = strlen($data); $l = strlen($key); $char = ''; for ($i = 0; $i
10 . 多维数组降级
function array_flatten($arr) { $result = [];array_walk_recursive($arr, function($value) use (&$result) {$result[] = $value; });return $result;}print_r(array_flatten([1,[2,3],[4,5]]));// [1,[2,3],[4,5]] => [1,2,3,4,5]// var new_array = old_array.concat(value1[, value2[, ...[, valuen]]])var test = [1,2,3,[4,5,6],[7,8]];[].concat.apply([], test); // [1,2,3,4,5,6,7,8] 对于 test 数组中的每一个 value， 将它 concat 到空数组 [] 中去，，而因为 concat 是 array 的 prototype，所以我们用一个空 array 作载体var test1 = [1,2,[3,[4,[5]]]];function flatten(arr) { return arr.reduce(function(pre, cur) {if(array.isarray(cur)) {return flatten(pre.concat(cur));}return pre.concat(cur); }, []);}// [1,2,3,4,5]json_encode中文function json_encode_wrapper ($result){ if(defined('json_unescaped_unicode')){return json_encode($result,json_unescaped_unicode|json_numeric_check); }else {return preg_replace(array(#\\\u([0-9a-f][0-9a-f][0-9a-f][0-9a-f])#ie, /\(\d+)\http://www.jb51.net/,),array(iconv('ucs-2', 'utf-8', pack('h4', '\\1')), \\1),json_encode($result)); }}
12.二维数组去重