php 删除左端与右端空格函数

<?php
 $t=" ...I'm Jacky...";
 echo "a" .$t ."<br>";
 $left=ltrim($t);
 echo "a" .$left ."<br>";
 $lleft=ltrim($left,".");
 echo $lleft;
?>

<?php
 $a="htm ";
 echo $a ."l" ."<br>";
 echo rtrim($a) ."l";
?>

$str = ” This line containstliberal rn use of   whitespace.nn”;

// 首先去掉头尾空格
$str = trim($str);

// 接着去掉两个空格以上的

$str = preg_replace(’/s(?=s)/’, ‘’, $str);

// 最后将非空格替换为一个空格
$str = preg_replace(’/[nrt]/’, ‘ ‘, $str);

<?
$str="　　　 　一聚教程网 www.111cn.net 　　　　";
$str = mb_ereg_replace('^(　| )+', '', $str);
$str = mb_ereg_replace('(　| )+$', '', $str);
echo mb_ereg_replace('　　', "n　　", $str);
?>

<?php
 $str="this is a test";
 echo substr_count($str,'is') .'<br>';
 echo substr_count($str,'is',3) .'<br>';
 echo substr_count($str,'is',3,3) .'<br>';
?>

<?php
$str = 'http://www.111cn.net 爱程序网_软件编程入门教程_软件设计交流_字符出现次数';
echo substr_count($str,'w').'<br />';
echo substr_count($str,'t').'<br />';
echo substr_count($str,'爱程序网');
?>

输出结果为：
//以下是输出结果
3
2
1

<?php
echo strtolower("Hello WORLD!");
?>

<?php
$str = "Mary Had A Little Lamb and She LOVED It So";
$str = strtoupper($str);
echo $str; // 打印 MARY HAD A LITTLE LAMB AND SHE LOVED IT SO
?>

<?php
 $foo = 'hello world!';
 $foo = ucwords($foo);             // Hello World!
 
 
 $bar = 'HELLO WORLD!';
 $bar = ucwords($bar);             // HELLO WORLD!
 $bar = ucwords(strtolower($bar)); // Hello World!
 ?>

<?php
 $foo = 'HelloWorld';
 $foo = lcfirst($foo);             // helloWorld
 
 $bar = 'HELLO WORLD!';
 $bar = lcfirst($bar);             // hELLO WORLD!
 $bar = lcfirst(strtoupper($bar)); // hELLO WORLD!
 ?>

<?php
$file = "111.txt";
$fp = fopen($file,"r");
if ($fp){
 while(!feof($fp)){
  //第二个参数为读取的长度
  $data = fread($fp, 1000);
 }
 fclose($fp);
}
echo $data;
?>

<?php
echo file_get_contents("test.txt");
?>

输出：

This is a test file with test text.

<?php
$dir = opendir('/movie');
while(($file = readdir($dir))!=false){
  if ($file!="." && $file!="..") {
    $ns = explode('.', $file);
    echo $ns[0];
  }
}
closedir($dir);

?>

1 echo date('Y-m-d H:i:s',strtotime('now')+8*60*60);
结果:2013-04-05 03:15:02

1 echo date('Y-m-d H:i:s',time()+8*60*60);
结果:2013-04-05 03:15:02

1 echo date('Y-m-d H:i:s',strtotime("+10 days")+8*60*60);

1 strtotime("+1 week")+8*60*60

strtotime("+7 days");

1 strtotime ("+1 week 2 days 4 hours 2 seconds")+8*60*60
1 echo date('Y-m-d H:i:s',strtotime ("+1 week 2 days 4 hours 2 seconds")+8*60*60);

1 strtotime ("last Monday")+8*60*60
1 echo date('Y-m-d H:i:s',strtotime ("last Monday")+8*60*60);

1 strtotime ("next Thursday")+8*60*60
1 echo date('Y-m-d H:i:s',strtotime ("next Thursday")+8*60*60);

<?php
$time="2012年11月23日15时50时20秒";
$times="2013-01-14 09:09:09";
if(strtotime($time)-strtotime($times)<0){
 echo "时间：".$time."&nbsp;早于时间：".$times;
}else{
 echo "时间：".$times."&nbsp;早于时间：".$time;
}
echo "<br />它们相差的时间值是：".(strtotime($time)-strtotime($times))
?>