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(一） https://www.liaoxuefeng.com/wiki/0014316089557264a6b348958f449949df42a6d3a2e542c000/001431664106267f12e9bef7ee14cf6a8776a479bdec9b9000 Unicode标准也在不断发展，但最常用的是用两个字节表示一个字符（如果要用到非常偏僻的字符，就需要4个字节）。现

global variable is variable declared outside any function, not local to any function. <?php $x = 2; function test1(){ global $x; echo $x; } function test2(){ global $x; //can also be re

mysql: <?php //1. Create a database connection $connection = mysql_connect("localhost", "root", "****"); if(!$connection){ die("Database connection failed: " . mysql_error()); } //2. Selec

As others have said,!DOCTYPEis necessary in php scripts that are outputting HTML. If you were creating an image or executing a bash file or something, the story would be different. As for where it ...