php删除数组元素几种方法

array("a","b","c","d","e","f","g")

$arr = array_slice($arr, 0, 3);

<?php
$arr = array("a"=>"a1","b"=>'b1',"c"=>"a2","d"=>"a1");
$arr1 = array_flip($arr);
print_r($arr1);//先反转一次,去掉重复值,输出Array ( [a1] => d [b1] => b [a2] => c )
$arr2 = array_flip($arr);
print_r($arr2);//再反转回来,得到去重后的数组,输出Array ( [a1] => d [b1] => b [a2] => c )
$arr3 = array_unique($arr);
print_r($arr3);//利用php的array_unique函数去重,输出Array ( [a] => a1 [b] => b1 [c] => a2 )
?>

<?php
$arr = array('a','b','c','d');
unset($arr[1]);
print_r($arr);
?>

<?php

$file = 'monkey.gif';

if (file_exists($file)) {

header('Content-Description: File Transfer');

header('Content-Type: application/octet-stream');

header('Content-Disposition: attachment; filename='.basename($file));

header('Content-Transfer-Encoding: binary');

header('Expires: 0');

header('Cache-Control: must-revalidate, post-check=0, pre-check=0');

header('Pragma: public');

header('Content-Length: ' . filesize($file));

ob_clean();

flush();

readfile($file);

exit;

}

?>

<?php

public function fddAction()

{

// get attachment location

$attachment_location = $_SERVER["DOCUMENT_ROOT"] . "/pdf/fdd/sample.pdf";

if (file_exists($attachment_location)) {

// attachment exists

// send open pdf dialog to user

header('Cache-Control: public'); // needed for i.e.

header('Content-Type: application/pdf');

header('Content-Disposition: inline; filename="sample.pdf"');

readfile($attachment_location);

die(); // stop execution of further script because we are only outputting the pdf

} else {

die('Error: File not found.');

}

}

?>

<?php
include_once('PHPExcel.php');
//read excel file;
$PHPExcel = new PHPExcel();    
$PHPReader = new PHPExcel_Reader_Excel5();
$PHPExcel = $PHPReader->load('/home/yuanjianjun/taobao_cat.xls');
$currentSheet = $PHPExcel->getSheet(0);
$allColumn = $currentSheet->getHighestColumn();
$allRow = $currentSheet->getHighestRow();
for($currentRow = 1; $currentRow<=$allRow; $currentRow++){
   for($currentColumn='A'; $currentColumn<=$allColumn; $currentColumn++){  
    $address = $currentColumn.$currentRow;  
    echo $currentSheet->getCell($address)->getValue()."t";  
   }
   echo "n";
}

//write excel file
$objExcel = new PHPExcel();
$objWriter = new PHPExcel_Writer_Excel5($objExcel);
$objProps = $objExcel->getProperties();  
$objProps->setCreator("yuan");
$objProps->setLastModifiedBy("yuan");
$objProps->setTitle("excel test");  
$objProps->setSubject("my excel test");
$objProps->setDescription("hello world.");  
$objProps->setKeywords("PHPExcel");
$objProps->setCategory("EXCEL");
$objExcel->setActiveSheetIndex(0);
$objActSheet = $objExcel->getActiveSheet();
$objActSheet->setTitle('TEST1');
$objActSheet->setCellValue('A1', '字符串内容');
$objActSheet->setCellValue('A2', 26);
$objActSheet->setCellValue('A3', true);
$objActSheet->setCellValue('A4', '=A2+A2');
$objWriter->save('/home/yuanjianjun/helloworld.xls');  

//copy excel format
$objReader = PHPExcel_IOFactory::createReader('Excel5');
$objPHPExcel = $objReader->load('/home/yuanjianjun/20100301.xls');
$objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel5');
$objWriter->_phpExcel->setActiveSheetIndex(0);
$objWriter->_phpExcel->getActiveSheet()->setCellValue('A1', 'FESDF');
$objWriter->_phpExcel->getActiveSheet()->setCellValue('B1', 'S');
$objWriter->_phpExcel->getActiveSheet()->setCellValue('C1', 'FEFSD');
$objWriter->_phpExcel->getActiveSheet()->setCellValue('D1', 'SDFD');
$objWriter->_phpExcel->getActiveSheet()->setCellValue('E1', '淘宝CPS');
$objWriter->save('/home/yuanjianjun/copy.xls');

<?php
class Exception
{
    protected $message = 'Unknown exception';   // 异常信息
    protected $code = 0;                        // 用户自定义异常代码
    protected $file;                            // 发生异常的文件名
    protected $line;                            // 发生异常的代码行号

    function __construct($message = null, $code = 0);

    final function getMessage();                // 返回异常信息
    final function getCode();                   // 返回异常代码
    final function getFile();                   // 返回发生异常的文件名
    final function getLine();                   // 返回发生异常的代码行号
    final function getTrace();                  // backtrace() 数组
    final function getTraceAsString();          // 已格成化成字符串的 getTrace() 信息

    /* 可重载的方法 */
    function __toString();                       // 可输出的字符串
}
?>

try {
    $error = 'my error!';
    throw new Exception($error)
} catch (Exception $e) {
    echo $e->getMessage();
}

class MyException extends Exception
{
    // 重定义构造器使 message 变为必须被指定的属性
    public function __construct($message, $code = 0) {
        // 自定义的代码

        // 确保所有变量都被正确赋值
        parent::__construct($message, $code);
    }

    // 自定义字符串输出的样式
    public function __toString() {
        return __CLASS__ . ": [{$this->code}]: {$this->message}n";
    }

    public function customFunction() {
        echo "A Custom function for this type of exceptionn";
    }
}
　　

　　Throw new Exception(‘message’,code);

Catch(Exception $e)

{

   //handing exception

}

<?php
/**
* 逆序二维数组插入一元素
*
* @author WadeYu
* @date 2012-05-30
*/
$aSorted = array(
array(1, 100),
array(2, 90),
array(3, 80),
array(4, 70),
array(5, 60),
array(6, 50),
array(7, 40),
array(8, 40),
array(9, 40),
array(10, 20),
);
$aInsert = array(11, 40);
$maxCmpIdx = 0;
$cnt = 0;
$maxCnt = 10;
foreach ($aSorted as $idx => $arr){
if ($arr[0] == $aInsert[0]){
$maxCmpIdx = $idx;
}
$cnt++;
}
if ( !$maxCmpIdx){
$maxCmpIdx = $cnt++;
}
$aSorted[$maxCmpIdx] = $aInsert;
for ($i = $maxCmpIdx; $i > 0; $i--){
if ($aSorted[$i][1] > $aSorted[$i-1][1]){
$aTmp = $aSorted[$i-1];
$aSorted[$i-1] = $aSorted[$i];
$aSorted[$i] = $aTmp;
continue ;
}
break;
}
for ($i = $cnt; $i > $maxCnt; $i--){
unset($aSorted[$i-1]);
}
print_r($aSorted);