PHP if和or哪个效率对比

<?php
$t1 = microtime();
 
while($i<=10000){
    if(!defined('APP_PATH'));      // 0.011059
    // defined('APP_PATH') OR 1;   // 0.009398
    $i++;
}
 
$t2 = microtime();
echo $t2 - $t1;
?>

<?php
$t1 = microtime();
 
while($i<=1000000){
    if(!defined('APP_PATH'));      //0.20043
    // defined('APP_PATH') OR 1;   //0.107475
    $i++;
}
 
$t2 = microtime();
echo $t2 - $t1;
?>

$ftp_server='www.111cn.net';//服务器
$ftp_user_name='111cn.net';//用户名
$ftp_user_pass='password';//密码
$ftp_port='21';//端口
$ftp_put_dir='data/photo/thumb/data2';//上传目录

$ftp_conn_id = ftp_connect($ftp_server,$ftp_port);
$ftp_login_result = ftp_login($ftp_conn_id, $ftp_user_name, $ftp_user_pass);

if((!$ftp_conn_id) || (!$ftp_login_result)) {
echo'连接到ftp服务器失败';
exit;
}else{

ftp_pasv($ftp_conn_id,true); //返回一下模式，这句很奇怪，有些ftp服务器一定需要执行这句

ftp_chdir($ftp_conn_id, $ftp_put_dir);
$ftp_upload = ftp_put($ftp_conn_id, '3c264461abdf49de2ddaabc3426ceb65.jpg', 'data111cn.net3c264461abdf49de2ddaabc3426ceb65.jpg', FTP_BINARY);
//var_dump($ftp_upload);//看看是否写入成功
ftp_close($ftp_conn_id); //断开
}

Array ( [a] => Horse [b] => Cat [c] => Cow )

<?php
echo "rn第一种情况rn";
$a=array(1,2,3,4,5,6);
$b=array(7,8,9);
 
$c=array_merge ($a,$b);
print_r($c);
$c=$a+$b;
print_r($c);
$c=$b+$a;
print_r($c);
 
 
echo "rn第二种情况rn";
$a=array('a','b','c','d','e','f');
$b=array('a','x','y');
 
$c=array_merge ($a,$b);
print_r($c);
$c=$a+$b;
print_r($c);
$c=$b+$a;
print_r($c);
 
 
echo "rn第三种情况rn";
 
$a=array(
 1=>'a',
 2=>'b',
 3=>'c',
 4=>'d',
 5=>'e',
 6=>'f');
$b=array(
 1=>'a',
 7=>'x',
 8=>'y');
 
$c=array_merge ($a,$b);
print_r($c);
$c=$a+$b;
print_r($c);
$c=$b+$a;
print_r($c);
?>

<?php

//截取中文字符串

function mysubstr($str, $start, $len) {

$tmpstr = “”; $strlen = $start + $len;
for($i = 0; $i < $strlen; $i++) {

if(ord(substr($str, $i, 1)) > 0xa0) {

$tmpstr .= substr($str, $i, 2); $i++;

}

else $tmpstr .= substr($str, $i, 1);

}

return $tmpstr;

}

?>

<?php

//截取utf8字符串
function utf8Substr($str, $from, $len)

{

return preg_replace(‘#^(?:[x00-x7F]|[xC0-xFF][x80-xBF]+){0,’.$from.’}’.
‘((?:[x00-x7F]|[xC0-xFF][x80-xBF]+){0,’.$len.’}).*#s’, ‘$1′,$str);
}

?>

$_SERVER['SERVER_NAME']:  www.111cn.net

$_SERVER['SERVER_PORT'] : 80

$_SERVER['REQUEST_URI'] : /Test/Test.php