php 代码片段

来源：互联网发布：java经典算法100例编辑：程序博客网时间：2024/05/05 11:38

php 将已定义好的数组的key，改变为从1开始

方法1：

$array = array('a', 'b', 'c'); // defined elsewhere$array = array_filter(array_merge(array(0), $array));//还可以使用 两次 array_flip();进行去重

方法2：

$array = array("a","b","c");array_unshift($array,"");unset($array[0]);

方法3：

for ($a = 0; $a < 1000; ++$a) {    $alphabet = array("a", "b", "c");    array_unshift($alphabet, "phoney");    unset($alphabet[0]);}

php 判断与去除数组中重复数据的方法

//判断if (count($array) != count(array_unique($array))) {      echo '该数组有重复值';  }//去除$input = array("a" => "green","", "red","b" => "green", "","blue", "red","c" => "witer","hello","witer");//$result = array_unique($input); //去除重复元素$result = a_array_unique($input);   //只留下单一元素foreach($result as $aa) {    echo $aa."<br />";}function multi_unique($array) {   foreach ($array as $k=>$na) {       $new[$k] = serialize($na);   }   $uniq = array_unique($new);   foreach($uniq as $k=>$ser) {       $new1[$k] = unserialize($ser);   }   return ($new1);}function a_array_unique($array) {//写的比较好   $out = array();   foreach ($array as $key=>$value) {       if (!in_array($value, $out)) {           $out[$key] = $value;       }   }   return $out;} //PHP数组去除重复项 有个内置函数array_unique ()，但是php的 array_unique函数只适用于一维数组，//对多维数组并不适用。//以下实现一个二维数组的array_unique函数：function unique_arr($array2D,$stkeep=false,$ndformat=true){    // 判断是否保留一级数组键 (一级数组键可以为非数字)    if($stkeep) {        $stArr = array_keys($array2D);    }    // 判断是否保留二级数组键 (所有二级数组键必须相同)    if($ndformat) {        $ndArr = array_keys(end($array2D));    }    //降维,也可以用implode,将一维数组转换为用逗号连接的字符串    foreach ($array2D as $v) {        $v = join(",",$v);         $temp[] = $v;    }    //去掉重复的字符串,也就是重复的一维数组    $temp = array_unique($temp);     //再将拆开的数组重新组装    foreach ($temp as $k => $v) {        if($stkeep){            $k = $stArr[$k];        }        if($ndformat) {            $tempArr = explode(",",$v);             foreach($tempArr as $ndkey => $ndval) {                $output[$k][$ndArr[$ndkey]] = $ndval;            }        } else {            $output[$k] = explode(",",$v);        }    }    return $output;}//测试$array2D = array(    'first'=>array('title'=>'1111','date'=>'2222'),    'second'=>array('title'=>'1111','date'=>'2222'),    'third'=>array('title'=>'2222','date'=>'3333')); print_r($array2D);  print_r(unique_arr($array2D, true));

php 输出 A-Z AA-ZZ

$addon = 64;for ($i = 1; $i <= 700; $i++) {    $prefix = "";    if ($i > 26) {        $remainder = floor($i / 26);        $prefix = chr($remainder + $addon);    }    $ivalue = ($i % 26 == 0) ? 26 : $i % 26;    echo $prefix . chr($addon + $ivalue) . "<br />";}

输出 AA - ZZ

    foreach (range('A', 'Z') as $char) {        foreach (range('A', 'Z') as $char1) {            echo $char . $char1. "\n";        }    }

输出 AA - ZY

for($x = 'A'; $x < 'ZZ'; $x++){    echo $x, ' ';}

php 输出文件的大小 kB

//代码也可以用于统计目录数//格式化输出目录大小 单位：Bytes，KB，MB，GBfunction getDirectorySize($path){    $totalsize  = 0;    $totalcount = 0;    $dircount   = 0;    if ($handle = opendir($path)) {        while (false !== ($file = readdir($handle))) {            $nextpath = $path . '/' . $file;            if ($file != '.' && $file != '..' && !is_link($nextpath)) {                if (is_dir($nextpath)) {                    $dircount++;                    $result = getDirectorySize($nextpath);                    $totalsize += $result['size'];                    $totalcount += $result['count'];                    $dircount += $result['dircount'];                } elseif (is_file($nextpath)) {                    $totalsize += filesize($nextpath);                    $totalcount++;                }            }        }    }    closedir($handle);    $total['size']     = $totalsize;    $total['count']    = $totalcount;    $total['dircount'] = $dircount;    return $total;}

public function formatBytes($size, $precision = 2){    if ($size > 0) {        $size = (int) $size;        $base = log($size) / log(1024);        $suffixes = array(' bytes', ' KB', ' MB', ' GB', ' TB');        return round(pow(1024, $base - floor($base)), $precision) . $suffixes[floor($base)];    } else {        return $size;    }}

function calcSize($size, $accuracy = 2){    $units = array('B', 'KB', 'MB', 'GB');    foreach ($units as $n => $u) {        $div = pow(1024, $n);        if ($size > $div) $output = number_format($size / $div, $accuracy) . $u;    }    return $output;}

function getNiceFileSize($file, $digits = 2){    if (is_file($file)) {        $filePath = $file;        if (!realpath($filePath)) {            $filePath = $_SERVER["DOCUMENT_ROOT"] . $filePath;        }        $fileSize = filesize($filePath);        $sizes = array("TB", "GB", "MB", "KB", "B");        $total = count($sizes);        while ($total-- && $fileSize > 1024) {            $fileSize /= 1024;        }        return round($fileSize, $digits) . " " . $sizes[$total];    }    return false;}

$units = explode(' ','B KB MB GB TB PB');echo("<html><body>");echo('file size: ' . format_size(filesize("example.txt")));echo("</body></html>");function format_size($size){    $mod = 1024;    for ($i = 0; $size > $mod; $i++) {        $size /= $mod;    }    $endIndex = strpos($size, ".")+3;    return substr( $size, 0, $endIndex).' '.$units[$i];}

function size2Byte($size){    $units = array('KB', 'MB', 'GB', 'TB');    $currUnit = '';    while (count($units) > 0  &&  $size > 1024) {        $currUnit = array_shift($units);        $size /= 1024;    }    return ($size | 0) . $currUnit;}

public function sizeFilter( $bytes ){    $label = array( 'B', 'KB', 'MB', 'GB', 'TB', 'PB' );    for( $i = 0; $bytes >= 1024 && $i < ( count( $label ) -1 ); $bytes /= 1024, $i++ );    return( round( $bytes, 2 ) . " " . $label[$i] );}

function filesize_formatted($path){    //filesize() 函数不能判断 大于2G 的文件    $size = filesize($path);    $units = array( 'B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB');    $power = $size > 0 ? floor(log($size, 1024)) : 0;    return number_format($size / pow(1024, $power), 2, '.', ',') . ' ' . $units[$power];}

function Size($path){    $bytes = sprintf('%u', filesize($path));    if ($bytes > 0) {        $unit = intval(log($bytes, 1024));        $units = array('B', 'KB', 'MB', 'GB');        if (array_key_exists($unit, $units) === true) {            return sprintf('%d %s', $bytes / pow(1024, $unit), $units[$unit]);        }    }    return $bytes;}

这个方法用于将秒数转换成年，月，周，日等。

function Sec2Time($time){    if (is_numeric($time)) {        $value = [            "years"   => 0, "days" => 0, "hours" => 0,            "minutes" => 0, "seconds" => 0,        ];        if ($time >= 31556926) {            $value["years"] = floor($time / 31556926);            $time           = ($time % 31556926);        }        if ($time >= 86400) {            $value["days"] = floor($time / 86400);            $time          = ($time % 86400);        }        if ($time >= 3600) {            $value["hours"] = floor($time / 3600);            $time           = ($time % 3600);        }        if ($time >= 60) {            $value["minutes"] = floor($time / 60);            $time             = ($time % 60);        }        $value["seconds"] = floor($time);        return (array)$value;    } else {        return (bool)false;    }}echo '<pre>';print_r(Sec2Time(5));

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