php基本函数合集
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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 $t['name'].'<br>'; if(isset($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; }
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 < $month; $i++) { $fab[$i] = $fab[$i - 1] + $fab[$i - 2]; }
for ($i = 0; $i < $month; $i++) { echo sprintf("第{%d}个月兔子为：{%d}",$i, $fab[$i])."<br/>"; } 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 < $len; $i++) { if ($x == $l) { $x = 0; } $char .= $key{$x}; $x++; } $str = ''; for ($i = 0; $i < $len; $i++) { $str .= chr(ord($data{$i}) + (ord($char{$i})) % 256); } return base64_encode($str); }
function decrypt($data, $key) { $key = md5($key); $x = 0; $data = base64_decode($data); $len = strlen($data); $l = strlen($key); $char = ''; for ($i = 0; $i < $len; $i++) { if ($x == $l) { $x = 0; } $char .= substr($key, $x, 1); $x++; } $str = ''; for ($i = 0; $i < $len; $i++) { if (ord(substr($data, $i, 1)) < ord(substr($char, $i, 1))) { $str .= chr((ord(substr($data, $i, 1)) + 256) - ord(substr($char, $i, 1))); } else { $str .= chr(ord(substr($data, $i, 1)) - ord(substr($char, $i, 1))); } } return $str; } 10 . 多维数组降级 function array_flatten($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($result,JSON_UNESCAPED_UNICODE|JSON_NUMERIC_CHECK); }else { return preg_replace( array("#///u([0-9a-f][0-9a-f][0-9a-f][0-9a-f])#ie", "//"(/d+)/"/",), array("iconv('UCS-2', 'UTF-8', pack('H4', '//1'))", "//1"), json_encode($result) ); } } 12.二维数组去重 $arr = array(
array('id'=>'2','title'=>'...','ding'=>'1','jing'=>'1','time'=>'...','url'=>'...','dj'=>'...'),
array('id'=>'2','title'=>'...','ding'=>'1','jing'=>'1','time'=>'...','url'=>'...','dj'=>'...')
); function about_unique($arr=array()){ /*将该种二维数组看成一维数组，则 该一维数组的value值有相同的则干掉只留一个，并将该一维 数组用重排后的索引数组返回，而返回的一维数组中的每个元素都是 原始key值形成的关联数组 */ $keys =array(); $temp = array(); foreach($arr[0] as $k=>$arrays) { /*数组记录下关联数组的key值*/ $keys[] = $k; } //return $keys; /*降维*/ foreach($arr as $k=>$v) { $v = join(",",$v); //降维 $temp[] = $v; } $temp = array_unique($temp); //去掉重复的内容 foreach ($temp as $k => $v){ /*再将拆开的数组按索引数组重新组装*/ $temp[$k] = explode(",",$v); } //return $temp; /*再将拆开的数组按关联数组key值重新组装*/ foreach($temp as $k=>$v) { foreach($v as $kkk=>$ck) { $data[$k][$keys[$kkk]] = $temp[$k][$kkk]; } } return $data; } 13.格式化字节大小 /** * 格式化字节大小 * @param number $size 字节数 * @param string $delimiter 数字和单位分隔符 * @return string 格式化后的带单位的大小 * @author */ function format_bytes($size, $delimiter = '') { $units = array('B', 'KB', 'MB', 'GB', 'TB', 'PB'); for ($i = 0; $size >= 1024 && $i < 6; $i++) $size /= 1024; return round($size, 2) . $delimiter . $units[$i]; } 14.3分钟前 /** * 将指定时间戳转换为截止当前的xx时间前的格式 例如 return '3分钟前'' * @param string|int $timestamp unix时间戳 * @return string */ function time_ago($timestamp) { $etime = time() - $timestamp; if ($etime < 1) return '刚刚'; $interval = array ( 12 * 30 * 24 * 60 * 60 => '年前 ('.date('Y-m-d', $timestamp).')', 30 * 24 * 60 * 60 => '个月前 ('.date('m-d', $timestamp).')', 7 * 24 * 60 * 60 => '周前 ('.date('m-d', $timestamp).')', 24 * 60 * 60 => '天前', 60 * 60 => '小时前', 60 => '分钟前', 1 => '秒前' ); foreach ($interval as $secs => $str) { $d = $etime / $secs; if ($d >= 1) { $r = round($d); return $r . $str; } }; } 15.身份证号 /** * 判断参数字符串是否为天朝身份证号 * @param $id 需要被判断的字符串或数字 * @return mixed false 或 array[有内容的array boolean为真] */ function is_citizen_id($id) { //长度效验 18位身份证中的X为大写 $id = strtoupper($id); if(!(preg_match('/^/d{17}(/d|X)$/',$id) || preg_match('/^/d{15}$/',$id))) { return false; } //15位老号码转换为18位 并转换成字符串 $Wi = array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2, 1); $Ai = array('1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2'); $cardNoSum = 0; if(strlen($id)==16) { $id = substr(0, 6).'19'.substr(6, 9); for($i = 0; $i < 17; $i++) { $cardNoSum += substr($id,$i,1) * $Wi[$i]; } $seq = $cardNoSum % 11; $id = $id.$Ai[$seq]; } //效验18位身份证最后一位字符的合法性 $cardNoSum = 0; $id17 = substr($id,0,17); $lastString = substr($id,17,1); for($i = 0; $i < 17; $i++) { $cardNoSum += substr($id,$i,1) * $Wi[$i]; } $seq = $cardNoSum % 11; $realString = $Ai[$seq]; if($lastString!=$realString) {return false;} //地域效验 $oCity = array(11=>"北京",12=>"天津",13=>"河北",14=>"山西",15=>"内蒙古",21=>"辽宁",22=>"吉林",23=>"黑龙江",31=>"上海",32=>"江苏",33=>"浙江",34=>"安徽",35=>"福建",36=>"江西",37=>"山东",41=>"河南",42=>"湖北",43=>"湖南",44=>"广东",45=>"广西",46=>"海南",50=>"重庆",51=>"四川",52=>"贵州",53=>"云南",54=>"西藏",61=>"陕西",62=>"甘肃",63=>"青海",64=>"宁夏",65=>"新疆",71=>"台湾",81=>"香港",82=>"澳门",91=>"国外"); $City = substr($id, 0, 2); $BirthYear = substr($id, 6, 4); $BirthMonth = substr($id, 10, 2); $BirthDay = substr($id, 12, 2); $Sex = substr($id, 16,1) % 2 ;//男1 女0 //$Sexcn = $Sex?'男':'女'; //地域验证 if(is_null($oCity[$City])) {return false;} //出生日期效验 if($BirthYear>2078 || $BirthYear<1900) {return false;} $RealDate = strtotime($BirthYear.'-'.$BirthMonth.'-'.$BirthDay); if(date('Y',$RealDate)!=$BirthYear || date('m',$RealDate)!=$BirthMonth || date('d',$RealDate)!=$BirthDay) { return false; } return array('id'=>$id,'location'=>$oCity[$City],'Y'=>$BirthYear,'m'=>$BirthMonth,'d'=>$BirthDay,'sex'=>$Sex); } 16.获取二维数组中某个key的集合 $user = array( 0 => array( 'id' => 1, 'name' => '张三', 'email' => 'zhangsan@sina.com', ), 1 => array( 'id' => 2, 'name' => '李四', 'email' => 'lisi@163.com', ), 2 => array( 'id' => 5, 'name' => '王五', 'email' => '10000@qq.com', ), ...... ); $ids = array(); $ids = array_map('array_shift', $user); $ids = array_column($user, 'id');//php5.5 $names = array(); $names = array_reduce($user, create_function('$v,$w', '$v[$w["id"]]=$w["name"];return $v;')); 以上所述就是本文的全部内容了，希望大家能够喜欢。 （编辑：银川站长网） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |
