辛星和您用更簡(jiǎn)略的方式去實(shí)現(xiàn)PHP中的驗(yàn)證碼
Jun 13, 2016 pm 12:03 PM
辛星和您用更簡(jiǎn)單的方式去實(shí)現(xiàn)PHP中的驗(yàn)證碼
? ? ? ?說實(shí)話,提到驗(yàn)證碼我想大家都不會(huì)陌生,確實(shí),驗(yàn)證碼還是挺常見的,現(xiàn)在搜索一下PHP的驗(yàn)證碼類簡(jiǎn)直是海量的數(shù)據(jù),那我們今天就來實(shí)現(xiàn)一個(gè)自己的驗(yàn)證碼把,不過它比較簡(jiǎn)單,這也是我說的用更簡(jiǎn)單的方式去實(shí)現(xiàn)一個(gè)驗(yàn)證碼。
? ? ? ?總的來說分成兩步,第一步就是先實(shí)現(xiàn)一個(gè)驗(yàn)證碼,第二步就是通過這個(gè)驗(yàn)證碼來進(jìn)行驗(yàn)證,我們先看一下如何去實(shí)現(xiàn)這個(gè)驗(yàn)證碼,當(dāng)然這里需要用到gd庫(kù)的知識(shí),請(qǐng)看下面的代碼示例:
<?php //首先要開啟sessionsession_start();//說明這是一張圖片header("Content-type:image/png");//用來動(dòng)態(tài)生成的數(shù)字和字母組合$str = "3,4,5,6,7,8,9,a,b,c,d,e,f,g";//轉(zhuǎn)化為數(shù)組$list = explode(",",$str);//得到該數(shù)組的下標(biāo)的最大值$max = count($list) - 1;//用于表示該驗(yàn)證碼$verify = "";//生成驗(yàn)證碼字符串for($i = 0; $i <5;$i ++){ $rand = mt_rand(0,$max); $verify .= $list[$rand];}//寫入session$_SESSION['code'] = $verify;//生成一個(gè)58x28的圖片$im = imagecreate(58,28);//產(chǎn)生黑色$black = imagecolorallocate($im,0,0,0);//產(chǎn)生白色$white = imagecolorallocate($im,255,255,255);//先用白色背景把圖片刷成白色imagefill($im,0,0,$white);//然后把字符串寫到圖片上去imagestring($im,5,10,8,$verify,$black);//生成png圖片,并且顯示到屏幕上imagepng($im);//銷毀該圖片imagedestroy($im);
? ? ? 這里順便說一下畫圖的基本步驟把:首先創(chuàng)建一個(gè)圖像,我們用imagecreate函數(shù),然后用imagecolorallocate來調(diào)色,然后用各種imagexxx來繪制圖像,最后用imagexxx來生成各種樣式的圖片,最后imagedestroy來銷毀圖片,大致都是這么一個(gè)流程。其中我感覺比較值得一提的是imagestring的參數(shù),第一個(gè)表示繪畫的圖片這個(gè)沒的說,第二額參數(shù)表示的是字體,如果為0,1,2,3,4,5則表示內(nèi)置字體,第三個(gè)參數(shù)表示繪畫的左上角的x坐標(biāo),第四個(gè)表示繪畫的左上角的y坐標(biāo),第五個(gè)參數(shù)是顏色,我們這里采用了黑色來繪圖。
來看一下我們生成的圖片是什么樣子的把:
那么我們?cè)趺词褂迷擈?yàn)證碼呢?既然文件都寫好了,那么我們?cè)賹懸粋€(gè)文件來導(dǎo)入該驗(yàn)證碼就可以了,然后從session里面來得到它的值,看如下代碼:
? ?這里使用了部分Javascript,如果讀者不熟悉Javascript,那么大可以跳過去,下面是運(yùn)行效果截圖:
看,當(dāng)然,真正的工程要復(fù)雜的多,這里給出的是一個(gè)示例程序,希望我們一同進(jìn)步。。
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