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                ## 1. 定義常亮 ~~~ define(); const PI = 3.14159; ~~~ ## 2.數據類型 ~~~ bolean(布爾型) integer(整型) float(浮點型) string(字符串) array(數組) object(對象) resource(資源) ~~~ ## 3.布爾型轉換 ~~~ (bool)0;false (bool)1;true (bool)-1;true (bool)0.0;false (bool)0.01;true (bool)-0.01;true (bool)'字符串';true (bool)'';false (bool)'0';false (bool)'0.0';true (bool)' ';true ~~~ ## 4.進制轉換 ~~~ 二進制 sprintf('%b',$str); 八進制 sprintf('O%o',$str); 十六進制 sprintf('OX%x',$str); ~~~ ## 5.循環語句 >continue;跳過本次循環 >break;退出當前循環 **while循環** ~~~ $i = 1; while($i <= 9){ echo $i; $i++; } ~~~ **do while循環** ~~~ $i = 1; do{ echo $i; $i++; }while($i <=10); ~~~ >do while循環會先執行一次; ## 5.其他常用 **調用函數外部變量** ~~~ global $name; ~~~ **靜態變量** ~~~ static $num = 0; ~~~ ## 6.數組過濾 ~~~ array_filter($arr,$function($v){return $v%2==0;}); ~~~ ## 7.計算字符串相似度百分比 ~~~ similar_text($str1,$str2)/strlen($str2)*100.'%'; ~~~ ## 8.網頁格式化函數 >**將字符串轉換為html實體** ~~~ $str = '<a href="http://www.baidu.com">百度</a>'; htmlspecialchars($str); htmlentities($str); ~~~ >**刪除字符串中的標簽** ~~~ strip_tags($str); ~~~ ## 9.字符串拆分與合并 >**字符串拆分為數組** ~~~ explode(',',$str); $str = '21,543:43@6534:432,543'; $res = preg_split('/[^0-9]/',$str); ~~~ >**數組組合為字符串** ~~~ implode(',',$arr); join(',',$arr); ~~~ ## 10.文件寫入與讀取 >**將字符串寫入文件** ~~~ file_put_contents('文件路徑',$a,File_APPEND); ~~~ >**讀取文件的內容** ~~~ file_get_contents('文件路徑'); ~~~ ## 11.date\time時間函數 >**設置時區** ~~~ date_default_timezone_set('Asia/Shanghai'); ~~~ >**當前時間** ~~~ time(); mktime(); strtotime('now'); ~~~ >**獲取指定時間的時間戳** ~~~ 1991年8月26日9點15分15秒 date('Y年m月d日H時i分s秒',mktime(9,15,15,8,26,1992)); date('Y年m月d日H時i分s秒',strtotime('1991-8-26 9:15:15')); ~~~ >**格式化時間戳** ~~~ date('Y年m月d日',time()); date('Y年m月d日H時i分s秒',time()); ~~~ >**獲取微妙** ~~~ microtime(true)->time(); ~~~
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