標籤：產生 sub 範圍 php www 拼接 ima count strcmp
1、隨機數和時間
echo rand(); //隨機數產生器
echo rand(0,10); //產生某個範圍內的隨機數
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>無標題文檔</title></head><body><?php echo rand(0,10);?></body></html>
輸出的結果是：
0到10之間的隨機數
echo time(); //取目前時間戳
echo date("Y-m-d H:i:s",1381253766); //格式化顯示時間
echo strtotime("2013-10-09 01:36:06"); //將字串轉換為時間戳記
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>無標題文檔</title></head><body><?php echo time(); //取目前時間戳echo date("Y-m-d H:i:s",1381253766); //格式化顯示時間echo strtotime("2013-10-09 01:36:06"); //將字串轉換為時間戳記?></body></html>
輸出的結果：
2.字串函數
$str = "Hello|World|ni|hao";
$attr = array("aa","bb","cc","dd");
echo strlen($str); //取字串的長度
var_dump(strcmp($str,"hello world")); //比較兩個字串
echo strtolower($str); //轉小寫
echo strtoupper($str); //轉大寫
var_dump(explode("|",$str)); //拆分字串，返回數組
echo implode("--",$attr); //將數組元素拼接成一個字串
echo substr_replace($str,"***",0,5); //替換指定位置的字串
//echo str_replace("|","***",$str); //尋找替換
//echo substr($str,0,5); //截取字串
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>無標題文檔</title></head><body><?php $str = "Hello|World|ni|hao";$attr = array("aa","bb","cc","dd");echo strlen($str); //取字串的長度var_dump(strcmp($str,"hello world")); //比較兩個字串echo strtolower($str); //轉小寫echo strtoupper($str); //轉大寫var_dump(explode("|",$str)); //拆分字串，返回數組echo implode("--",$attr); //將數組元素拼接成一個字串echo substr_replace($str,"***",0,5); //替換指定位置的字串echo str_replace("|","***",$str); //尋找替換echo substr($str,0,5); //截取字串?></body></html>
輸出的結果：
//3.Regex
$str =<<<A
內容
A;
echo preg_replace("/\d/","#",$str); //替換
var_dump(preg_split("/\d/",$str)); //拆分
preg_match("/\d/",$str,$arr); //匹配第一個滿足正則的字串
preg_match_all("/\d/",$str,$arr); //匹配所有滿足正則的字串
var_dump($arr);
preg_match_all("/\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*/",$str,$arr);
var_dump($arr);
4.數組方法
$attr = array(1,2,3,4,5,1);
var_dump(in_array(6,$attr)); //判斷某個值是否在數組裡面
var_dump(array_reverse($attr)); //翻轉數組
echo count($attr); //取數組長度
var_dump(array_unique($attr)); //去重
unset($attr[1]); //刪除數組的元素
var_dump(array_values($attr)); //重新索引
var_dump(array_merge($attr,array(5,6))); //合并數組
array_push($attr,"hello"); //向數組裡面添加一個元素，返回索引
php常用函數
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