echo print不是真正的函数，而是PHP语言结构

print_r可以打印出复杂类型变量的值(如数组,对象)

echo的执行效率最高。

echo 可以输出用”，”分割的多个字符串,print不行。

<?php
function Arrayfun($arr) {
 $str = implode(”,$arr); //把数组组成一个字符串
 $tempArr =  array();
 for ($i=0;$i<strlen($str);$i++) {
  $tempArr[] = $str[$i];
 }
 return $tempArr;
}

print_r(Arrayfun(Array(2,45,10,257)));

/**

输出
Array
(
    [0] => 2
    [1] => 4
    [2] => 5
    [3] => 1
    [4] => 0
    [5] => 2
    [6] => 5
    [7] => 7
)

*/

?>
print_r(Arrayfun(Array(2,45,10,257)));

echo fun($str+1);  

分析：本题其实不会输出任何结果，只是产生一个致命的错误。对于fun的参数是一个引用传递的变量，所以参数只能是变量。

同理，用实数做参数也会产生类似的错误。例如  fun(1);

//这个比较简单，考察的是对strpos掌握情况
//一定要用===,因为strpos可能会返回0
$a = ‘http://www.phppx.com’;
$b = ‘h’;
if (strpos($a,$b,0) === false) {
 echo ‘没有’;
} else {
 echo ‘有’;
}

?>

$a = ‘http://www.phppx.com’;
$b = ‘新程PHP培训’;
$a=$a.$b;
echo $b=substr($a,0,-1*strlen($b));
echo $a=substr($a,strlen($b));

//方法2,利用数组
$a = ‘http://www.phppx.com’;
$b = ‘新程PHP培训’;
$a = array($a,$b);
echo $b = $a[0];
echo $a= $a[1];

?>

之所以能够100%就业，最重要3个因素是：

• ·具有多年开发经验的老师认真负责的做好教学工作；
• ·非常全面、合理的lamp课程体系，课程内容即是以后工作内容；
• ·各位同学自身的不懈努力；

新程成立2年多以来，严格恪守“好好做教学，好好做就业”的宗旨，用铁一样事实一次次证明，新程PHP培训从来没有食言过，是真正对得起学员每一分学费的。

下面是8位同学的工作照。（注：我们绝不拿入学照，或者生活照当工作照，那样完全没有可信度）。以下所有同学QQ，手机联系方式都有，但是考虑到个人隐私，这里不方便公开。如想跟其中某位同学聊聊，请加QQ543850577（毛老师） 或者 QQ群100498385。（以下同学都在群里）

胡佳就业于：天啸融通（北京）科技有限公司	李金霞就业于：马可波罗网
祝清就业于：宏合窗景科技有限公司	李想就业于：无限新空信息技术有限公司
马曙光就业于：北京芙德中天科贸有限公司	金建丞就业于：国际教育科技有限公司
张鹏飞就业于：乐你游旅行网	王方超就业于：北京百德诚医疗科技有限公司

<?
/**
* @copyright 互联网
* @author bouchon
* 整理：www.phppx.com
* @desc 建立、操作、控制 ZIP 文件的类
*/

class zip
{
        var $datasec, $ctrl_dir = array();
        var $eof_ctrl_dir = “\x50\x4b\x05\x06\x00\x00\x00\x00″;
        var $old_offset = 0; var $dirs = Array(“.”);

        function get_List($zip_name)
        {
                $zip = @fopen($zip_name, ‘rb’);
                if(!$zip) return(0);
                $centd = $this->ReadCentralDir($zip,$zip_name);

                @rewind($zip);
                @fseek($zip, $centd['offset']);

                for ($i=0; $i<$centd['entries']; $i++)
                {
                        $header = $this->ReadCentralFileHeaders($zip);
                        $header['index'] = $i;$info['filename'] = $header['filename'];
                        $info['stored_filename'] = $header['stored_filename'];
                        $info['size'] = $header['size'];$info['compressed_size']=$header['compressed_size'];
                        $info['crc'] = strtoupper(dechex( $header['crc'] ));
                        $info['mtime'] = $header['mtime']; $info['comment'] = $header['comment'];
                        $info['folder'] = ($header['external']==0×41FF0010||$header['external']==16)?1:0;
                        $info['index'] = $header['index'];$info['status'] = $header['status'];
                        $ret[]=$info; unset($header);
                }
                return $ret;
        }

        function Add($files,$compact)
        {
                if(!is_array($files[0])) $files=Array($files);

                for($i=0;$files[$i];$i++){
                        $fn = $files[$i];
                        if(!in_Array(dirname($fn[0]),$this->dirs))
                        $this->add_Dir(dirname($fn[0]));
                        if(basename($fn[0]))
                        $ret[basename($fn[0])]=$this->add_File($fn[1],$fn[0],$compact);
                }
                return $ret;
        }

        function get_file()
        {
                $data = implode(”, $this -> datasec);
                $ctrldir = implode(”, $this -> ctrl_dir);

                return $data . $ctrldir . $this -> eof_ctrl_dir .
                pack(‘v’, sizeof($this -> ctrl_dir)).pack(‘v’, sizeof($this -> ctrl_dir)).
                pack(‘V’, strlen($ctrldir)) . pack(‘V’, strlen($data)) . “\x00\x00″;
        }

        function add_dir($name)
        {
                $name = str_replace(“\\”, “/”, $name);
                $fr = “\x50\x4b\x03\x04\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00″;

                $fr .= pack(“V”,0).pack(“V”,0).pack(“V”,0).pack(“v”, strlen($name) );
                $fr .= pack(“v”, 0 ).$name.pack(“V”, 0).pack(“V”, 0).pack(“V”, 0);
                $this -> datasec[] = $fr;

                $new_offset = strlen(implode(“”, $this->datasec));

                $cdrec = “\x50\x4b\x01\x02\x00\x00\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00″;
                $cdrec .= pack(“V”,0).pack(“V”,0).pack(“V”,0).pack(“v”, strlen($name) );
                $cdrec .= pack(“v”, 0 ).pack(“v”, 0 ).pack(“v”, 0 ).pack(“v”, 0 );
                $ext = “\xff\xff\xff\xff”;
                $cdrec .= pack(“V”, 16 ).pack(“V”, $this -> old_offset ).$name;

                $this -> ctrl_dir[] = $cdrec;
                $this -> old_offset = $new_offset;
                $this -> dirs[] = $name;
        }

        function add_File($data, $name, $compact = 1)
        {
                $name     = str_replace(‘\\’, ‘/’, $name);
                $dtime    = dechex($this->DosTime());

                $hexdtime = ‘\x’ . $dtime[6] . $dtime[7].’\x’.$dtime[4] . $dtime[5]
                . ‘\x’ . $dtime[2] . $dtime[3].’\x’.$dtime[0].$dtime[1];
                eval(‘$hexdtime = “‘ . $hexdtime . ‘”;’);

                if($compact)
                $fr = “\x50\x4b\x03\x04\x14\x00\x00\x00\x08\x00″.$hexdtime;
                else $fr = “\x50\x4b\x03\x04\x0a\x00\x00\x00\x00\x00″.$hexdtime;
                $unc_len = strlen($data); $crc = crc32($data);

                if($compact){
                        $zdata = gzcompress($data); $c_len = strlen($zdata);
                        $zdata = substr(substr($zdata, 0, strlen($zdata) – 4), 2);
                }else{
                        $zdata = $data;
                }
                $c_len=strlen($zdata);
                $fr .= pack(‘V’, $crc).pack(‘V’, $c_len).pack(‘V’, $unc_len);
                $fr .= pack(‘v’, strlen($name)).pack(‘v’, 0).$name.$zdata;

                $fr .= pack(‘V’, $crc).pack(‘V’, $c_len).pack(‘V’, $unc_len);

                $this -> datasec[] = $fr;
                $new_offset        = strlen(implode(”, $this->datasec));
                if($compact)
                $cdrec = “\x50\x4b\x01\x02\x00\x00\x14\x00\x00\x00\x08\x00″;
                else $cdrec = “\x50\x4b\x01\x02\x14\x00\x0a\x00\x00\x00\x00\x00″;
                $cdrec .= $hexdtime.pack(‘V’, $crc).pack(‘V’, $c_len).pack(‘V’, $unc_len);
                $cdrec .= pack(‘v’, strlen($name) ).pack(‘v’, 0 ).pack(‘v’, 0 );
                $cdrec .= pack(‘v’, 0 ).pack(‘v’, 0 ).pack(‘V’, 32 );
                $cdrec .= pack(‘V’, $this -> old_offset );

                $this -> old_offset = $new_offset;
                $cdrec .= $name;
                $this -> ctrl_dir[] = $cdrec;
                return true;
        }

        function DosTime() {
                $timearray = getdate();
                if ($timearray['year'] < 1980) {
                        $timearray['year'] = 1980; $timearray['mon'] = 1;
                        $timearray['mday'] = 1; $timearray['hours'] = 0;
                        $timearray['minutes'] = 0; $timearray['seconds'] = 0;
                }
                return (($timearray['year'] – 1980) << 25) | ($timearray['mon'] << 21) |     ($timearray['mday'] << 16) | ($timearray['hours'] << 11) |
                ($timearray['minutes'] << 5) | ($timearray['seconds'] >> 1);
        }

        function Extract ( $zn, $to, $index = Array(-1) )
        {
                $ok = 0; $zip = @fopen($zn,’rb’);
                if(!$zip) return(-1);
                $cdir = $this->ReadCentralDir($zip,$zn);
                $pos_entry = $cdir['offset'];

                if(!is_array($index)){ $index = array($index);  }
                for($i=0; $index[$i];$i++){
                        if(intval($index[$i])!=$index[$i]||$index[$i]>$cdir['entries'])
                        return(-1);
                }

                for ($i=0; $i<$cdir['entries']; $i++)
                {
                        @fseek($zip, $pos_entry);
                        $header = $this->ReadCentralFileHeaders($zip);
                        $header['index'] = $i; $pos_entry = ftell($zip);
                        @rewind($zip); fseek($zip, $header['offset']);
                        if(in_array(“-1″,$index)||in_array($i,$index))
                        $stat[$header['filename']]=$this->ExtractFile($header, $to, $zip);

                }
                fclose($zip);
                return $stat;
        }

        function ReadFileHeader($zip)
        {
                $binary_data = fread($zip, 30);
                $data = unpack(‘vchk/vid/vversion/vflag/vcompression/vmtime/vmdate/Vcrc/Vcompressed_size/Vsize/vfilename_len/vextra_len’, $binary_data);

                $header['filename'] = fread($zip, $data['filename_len']);
                if ($data['extra_len'] != 0) {
                        $header['extra'] = fread($zip, $data['extra_len']);
                } else { $header['extra'] = ”; }

                $header['compression'] = $data['compression'];$header['size'] = $data['size'];
                $header['compressed_size'] = $data['compressed_size'];
                $header['crc'] = $data['crc']; $header['flag'] = $data['flag'];
                $header['mdate'] = $data['mdate'];$header['mtime'] = $data['mtime'];

                if ($header['mdate'] && $header['mtime']){
                        $hour=($header['mtime']&0xF800)>>11;$minute=($header['mtime']&0×07E0)>>5;
                        $seconde=($header['mtime']&0×001F)*2;$year=(($header['mdate']&0xFE00)>>9)+1980;
                        $month=($header['mdate']&0×01E0)>>5;$day=$header['mdate']&0×001F;
                        $header['mtime'] = mktime($hour, $minute, $seconde, $month, $day, $year);
                }else{$header['mtime'] = time();}

                $header['stored_filename'] = $header['filename'];
                $header['status'] = “ok”;
                return $header;
        }

        function ReadCentralFileHeaders($zip){
                $binary_data = fread($zip, 46);
                $header = unpack(‘vchkid/vid/vversion/vversion_extracted/vflag/vcompression/vmtime/vmdate/Vcrc/Vcompressed_size/Vsize/vfilename_len/vextra_len/vcomment_len/vdisk/vinternal/Vexternal/Voffset’, $binary_data);

                if ($header['filename_len'] != 0)
                $header['filename'] = fread($zip,$header['filename_len']);
                else $header['filename'] = ”;

                if ($header['extra_len'] != 0)
                $header['extra'] = fread($zip, $header['extra_len']);
                else $header['extra'] = ”;

                if ($header['comment_len'] != 0)
                $header['comment'] = fread($zip, $header['comment_len']);
                else $header['comment'] = ”;

                if ($header['mdate'] && $header['mtime'])
                {
                        $hour = ($header['mtime'] & 0xF800) >> 11;
                        $minute = ($header['mtime'] & 0×07E0) >> 5;
                        $seconde = ($header['mtime'] & 0×001F)*2;
                        $year = (($header['mdate'] & 0xFE00) >> 9) + 1980;
                        $month = ($header['mdate'] & 0×01E0) >> 5;
                        $day = $header['mdate'] & 0×001F;
                        $header['mtime'] = mktime($hour, $minute, $seconde, $month, $day, $year);
                } else {
                        $header['mtime'] = time();
                }
                $header['stored_filename'] = $header['filename'];
                $header['status'] = ‘ok’;
                if (substr($header['filename'], -1) == ‘/’)
                $header['external'] = 0×41FF0010;
                return $header;
        }

        function ReadCentralDir($zip,$zip_name)
        {
                $size = filesize($zip_name);
                if ($size < 277) $maximum_size = $size;
                else $maximum_size=277;

                @fseek($zip, $size-$maximum_size);
                $pos = ftell($zip); $bytes = 0×00000000;

                while ($pos < $size)
                {
                        $byte = @fread($zip, 1); $bytes=($bytes << | Ord($byte);
                        if ($bytes == 0×504b0506){ $pos++; break; } $pos++;
                }

                $data=unpack(‘vdisk/vdisk_start/vdisk_entries/ventries/Vsize/Voffset/vcomment_size’,
                fread($zip, 18));

                if ($data['comment_size'] != 0)
                $centd['comment'] = fread($zip, $data['comment_size']);
                else $centd['comment'] = ”; $centd['entries'] = $data['entries'];
                $centd['disk_entries'] = $data['disk_entries'];
                $centd['offset'] = $data['offset'];$centd['disk_start'] = $data['disk_start'];
                $centd['size'] = $data['size'];  $centd['disk'] = $data['disk'];
                return $centd;
        }

        function ExtractFile($header,$to,$zip)
        {
                $header = $this->readfileheader($zip);

                if(substr($to,-1)!=”/”) $to.=”/”;
                if(!@is_dir($to)) @mkdir($to,0777);

                $pth = explode(“/”,dirname($header['filename']));
                for($i=0;isset($pth[$i]);$i++){
                        if(!$pth[$i]) continue;
                        if(!is_dir($to.$pth[$i])) @mkdir($to.$pth[$i],0777);
                }
                if (!($header['external']==0×41FF0010)&&!($header['external']==16))
                {
                        if ($header['compression']==0)
                        {
                                $fp = @fopen($to.$header['filename'], ‘wb’);
                                if(!$fp) return(-1);
                                $size = $header['compressed_size'];

                                while ($size != 0)
                                {
                                        $read_size = ($size < 2048 ? $size : 2048);
                                        $buffer = fread($zip, $read_size);
                                        $binary_data = pack(‘a’.$read_size, $buffer);
                                        @fwrite($fp, $binary_data, $read_size);
                                        $size -= $read_size;
                                }
                                fclose($fp);
                                touch($to.$header['filename'], $header['mtime']);

                        }else{
                                $fp = @fopen($to.$header['filename'].’.gz’,'wb’);
                                if(!$fp) return(-1);
                                $binary_data = pack(‘va1a1Va1a1′, 0×8b1f, Chr($header['compression']),
                                Chr(0×00), time(), Chr(0×00), Chr(3));

                                fwrite($fp, $binary_data, 10);
                                $size = $header['compressed_size'];

                                while ($size != 0)
                                {
                                        $read_size = ($size < 1024 ? $size : 1024);
                                        $buffer = fread($zip, $read_size);
                                        $binary_data = pack(‘a’.$read_size, $buffer);
                                        @fwrite($fp, $binary_data, $read_size);
                                        $size -= $read_size;
                                }

                                $binary_data = pack(‘VV’, $header['crc'], $header['size']);
                                fwrite($fp, $binary_data,8); fclose($fp);

                                $gzp = @gzopen($to.$header['filename'].’.gz’,'rb’) or die(“Cette archive est compress閑”);
                                if(!$gzp) return(-2);
                                $fp = @fopen($to.$header['filename'],’wb’);
                                if(!$fp) return(-1);
                                $size = $header['size'];

                                while ($size != 0)
                                {
                                        $read_size = ($size < 2048 ? $size : 2048);
                                        $buffer = gzread($gzp, $read_size);
                                        $binary_data = pack(‘a’.$read_size, $buffer);
                                        @fwrite($fp, $binary_data, $read_size);
                                        $size -= $read_size;
                                }
                                fclose($fp); gzclose($gzp);

                                touch($to.$header['filename'], $header['mtime']);
                                @unlink($to.$header['filename'].’.gz’);

                        }}
                        return true;
        }
}

?>

实例：

<?

require_once(“zip.lib.php”);
set_time_limit(100);

if(!$arch || !file_exists($arch))
die(‘<html><body><form action=”exemple.php”>
Entrez le chemin de l\’archive : <input type=text name=arch><br><br><input type=submit>
</form></body></html>’);

$z = new Zip;
$l=$z->get_list($arch);
?>
<html>
<head><title>ZipExplorer | <?=basename($arch)?> </title>
</head>
<body bgcolor=”#333366″>
<Table border=2 cellspadding=8 cellspacing=0 bgcolor=”#9999CC” align=center bordercolor=”#CCCCCC” width=”100%” height=”100%”>
<tr><td><br>
<h2 align=”center”>Navigateur Zip</h2>
<table align=”center” bgcolor=”#CCCCCC” cellspacing=0 cellpadding=3 border=2 bordercolor=”#000000″ width=”97%”>
<tr bgcolor=”#999999″><td><b>Nom</b></td>
<td width=”130″><b>Dossier</b></td><td width=”120″><b>Taille</b></td><td width=”120″><b>Comprs</b></td>
<td width=”90″><b>Ratio</b></td></tr>
<?
for($k=0;isset($l[$k]);$k++){
        $h=$l[$k];  $name=$h[stored_filename]; $isdir=$h[folder]; $id=$h[index]; $sub=”"; $mdir = dirname($name).”/”;
        if(!$h[folder]){ $s=$h[size]; $cs=$h[compressed_size]; $un=”Bytes”; $uni=”Bytes”; $ext=strtolower(substr($name,-4));if($ext==”.gif”||$ext==”.jpg”||$ext==”.png”||$ext==”.bmp”){}
        $ratio=@intval($cs/($s/100)+0,00001);
        if($s>1000){$s=substr($s/1000,0,5); $un=”Kb”; }if($s>1000){$s=substr($s/1000,0,5); $un=”Mb”; }if($s>1000){$s=substr($s/1000,0,5); $un=”Gb”; }
if($cs>1000){$cs=substr($cs/1000,0,5); $uni=”Kb”; }if($cs>1000){$cs=substr($cs/1000,0,5); $uni=”Mb”; }if($cs>1000){$cs=substr($cs/1000,0,5); $uni=”Gb”; } ?>

<tr><td style=”padding-left:12px;”><?=$name?></td><td><?=$sub?><?=$mdir?></td><td align=center><?=$s?> <?=$un?></td><td align=center><?=$cs?> <?=$uni?></td>
<td align=center><?=$ratio?> %</td></tr>
<? }}if($k==0){ ?><tr><td colspan=”7″ align=center><b>= Archive vide =</b></td></tr><? } ?>
</table><br></td></tr></table>
</html>