PHP操作Imagick库可以实现不少图片效果,比如在一张图片上,打印8*10的数字矩阵。以上效果的实现方法如下:
PHP操作Imagick库代码
<ol class="dp-c"> <li class="alt"><span><span class="comment"><font color="#008200">//格子的尺寸 </font></span><span> </span></span></li> <li class=""> <span></span><span class="vars"><font color="#dd0000">$grid_font_size</font></span><span> = 18; </span><span class="comment"><font color="#008200">//字体大小 </font></span><span> </span> </li> <li class="alt"> <span></span><span class="vars"><font color="#dd0000">$grid_font_color</font></span><span> = </span><span class="string"><font color="#0000ff">"#000"</font></span><span>; </span><span class="comment"><font color="#008200">//字体颜色 </font></span><span> </span> </li> <li class=""> <span></span><span class="vars"><font color="#dd0000">$grid_width</font></span><span> = 36; </span><span class="comment"><font color="#008200">//格子的宽度 </font></span><span> </span> </li> <li class="alt"> <span></span><span class="vars"><font color="#dd0000">$grid_height</font></span><span> = 24; </span><span class="comment"><font color="#008200">//格子的高度 </font></span><span> </span> </li> <li class=""> <span></span><span class="vars"><font color="#dd0000">$grid_origin_x</font></span><span> = 15; </span><span class="comment"><font color="#008200">//左上角的数字的起始横坐标 </font></span><span> </span> </li> <li class="alt"> <span></span><span class="vars"><font color="#dd0000">$grid_origin_y</font></span><span> = 98; </span><span class="comment"><font color="#008200">//左上角的数字的起始纵坐标 </font></span><span> </span> </li> <li class=""><span> </span></li> <li class="alt"><span> #原图 </span></li> <li class=""> <span> </span><span class="vars"><font color="#dd0000">$image</font></span><span> = </span><span class="keyword"><strong><font color="#006699">new</font></strong></span><span> Imagick(</span><span class="string"><font color="#0000ff">'background.jpg'</font></span><span>); </span> </li> <li class="alt"><span> </span></li> <li class=""><span> #写入密保卡数据 </span></li> <li class="alt"> <span> </span><span class="vars"><font color="#dd0000">$tmp_grid_origin_x</font></span><span> = </span><span class="vars"><font color="#dd0000">$grid_origin_x</font></span><span>; </span> </li> <li class=""> <span> </span><span class="vars"><font color="#dd0000">$tmp_grid_origin_y</font></span><span> = </span><span class="vars"><font color="#dd0000">$grid_origin_y</font></span><span>; </span> </li> <li class="alt"> <span> </span><span class="keyword"><strong><font color="#006699">foreach</font></strong></span><span> (</span><span class="vars"><font color="#dd0000">$pData</font></span><span> </span><span class="keyword"><strong><font color="#006699">as</font></strong></span><span> </span><span class="vars"><font color="#dd0000">$k</font></span><span> => </span><span class="vars"><font color="#dd0000">$v</font></span><span>){ </span> </li> <li class=""> <span> </span><span class="keyword"><strong><font color="#006699">foreach</font></strong></span><span> (</span><span class="vars"><font color="#dd0000">$v</font></span><span> </span><span class="keyword"><strong><font color="#006699">as</font></strong></span><span> </span><span class="vars"><font color="#dd0000">$k_grid_data</font></span><span> => </span><span class="vars"><font color="#dd0000">$v_grid_data</font></span><span>){ </span> </li> <li class="alt"> <span> </span><span class="vars"><font color="#dd0000">$tmp_grid_origin_x</font></span><span> += </span><span class="vars"><font color="#dd0000">$grid_width</font></span><span>; </span> </li> <li class=""> <span> </span><span class="vars"><font color="#dd0000">$draw</font></span><span> = </span><span class="keyword"><strong><font color="#006699">new</font></strong></span><span> ImagickDraw(); </span> </li> <li class="alt"> <span> </span><span class="vars"><font color="#dd0000">$draw</font></span><span>->setFillColor(</span><span class="vars"><font color="#dd0000">$grid_font_color</font></span><span>); </span> </li> <li class=""> <span> </span><span class="vars"><font color="#dd0000">$draw</font></span><span>->setFontSize(</span><span class="vars"><font color="#dd0000">$grid_font_size</font></span><span>); </span> </li> <li class="alt"> <span> </span><span class="vars"><font color="#dd0000">$draw</font></span><span>->annotation(</span><span class="vars"><font color="#dd0000">$tmp_grid_origin_x</font></span><span>, </span><span class="vars"><font color="#dd0000">$tmp_grid_origin_y</font></span><span>, </span><span class="vars"><font color="#dd0000">$v_grid_data</font></span><span>); </span> </li> <li class=""> <span> </span><span class="vars"><font color="#dd0000">$image</font></span><span>->drawImage(</span><span class="vars"><font color="#dd0000">$draw</font></span><span>); </span> </li> <li class="alt"><span> } </span></li> <li class=""> <span> </span><span class="vars"><font color="#dd0000">$tmp_grid_origin_x</font></span><span> = </span><span class="vars"><font color="#dd0000">$grid_origin_x</font></span><span>; </span> </li> <li class="alt"> <span> </span><span class="vars"><font color="#dd0000">$tmp_grid_origin_y</font></span><span> += </span><span class="vars"><font color="#dd0000">$grid_height</font></span><span>; </span> </li> <li class=""><span> } </span></li> <li class="alt"> <span> </span><span class="vars"><font color="#dd0000">$image</font></span><span>->writeImage(</span><span class="vars"><font color="#dd0000">$ks_ImageSrcPath</font></span><span>. </span><span class="vars"><font color="#dd0000">$pSN</font></span><span>. </span><span class="string"><font color="#0000ff">'.jpg'</font></span><span>); </span> </li> <li class=""><span> </span></li> <li class="alt"><span> #释放资源 </span></li> <li class=""> <span> </span><span class="vars"><font color="#dd0000">$image</font></span><span>->destroy(); </span> </li> <li class="alt"> <span> </span><span class="vars"><font color="#dd0000">$draw</font></span><span>->destroy(); </span> </li> <li class=""><span> </span></li> </ol>
这样做的后果是,在每次循环的时候,都要实例化一个ImagickDraw,并执行drawImage方法,非常占用CPU资源。
可以从以下两点优化:
1. 不必每次都执行new操作,一个就够了;
2. 不必每次都执行drawImage方法,一次就够了。也就是说,annotation方法好像具有“附加”的意味,不用担心后来的覆盖掉之前的;
PHP操作Imagick库优化后代码如下:
<ol class="dp-c"> <li class="alt"><span><span class="vars"><font color="#dd0000">$draw</font></span><span> = </span><span class="keyword"><strong><font color="#006699">new</font></strong></span><span> ImagickDraw(); </span></span></li> <li class=""> <span></span><span class="vars"><font color="#dd0000">$draw</font></span><span>->setFillColor(</span><span class="vars"><font color="#dd0000">$grid_font_color</font></span><span>); </span> </li> <li class="alt"> <span></span><span class="vars"><font color="#dd0000">$draw</font></span><span>->setFontSize(</span><span class="vars"><font color="#dd0000">$grid_font_size</font></span><span>); </span> </li> <li class=""> <span></span><span class="keyword"><strong><font color="#006699">foreach</font></strong></span><span> (</span><span class="vars"><font color="#dd0000">$pData</font></span><span> </span><span class="keyword"><strong><font color="#006699">as</font></strong></span><span> </span><span class="vars"><font color="#dd0000">$k</font></span><span> => </span><span class="vars"><font color="#dd0000">$v</font></span><span>){ </span> </li> <li class="alt"> <span> </span><span class="keyword"><strong><font color="#006699">foreach</font></strong></span><span> (</span><span class="vars"><font color="#dd0000">$v</font></span><span> </span><span class="keyword"><strong><font color="#006699">as</font></strong></span><span> </span><span class="vars"><font color="#dd0000">$k_grid_data</font></span><span> => </span><span class="vars"><font color="#dd0000">$v_grid_data</font></span><span>){ </span> </li> <li class=""> <span> </span><span class="vars"><font color="#dd0000">$tmp_grid_origin_x</font></span><span> += </span><span class="vars"><font color="#dd0000">$grid_width</font></span><span>; </span> </li> <li class="alt"> <span> </span><span class="vars"><font color="#dd0000">$draw</font></span><span>->annotation(</span><span class="vars"><font color="#dd0000">$tmp_grid_origin_x</font></span><span>, </span><span class="vars"><font color="#dd0000">$tmp_grid_origin_y</font></span><span>, </span><span class="vars"><font color="#dd0000">$v_grid_data</font></span><span>); </span> </li> <li class=""><span> } </span></li> <li class="alt"> <span> </span><span class="vars"><font color="#dd0000">$tmp_grid_origin_x</font></span><span> = </span><span class="vars"><font color="#dd0000">$grid_origin_x</font></span><span>; </span> </li> <li class=""> <span> </span><span class="vars"><font color="#dd0000">$tmp_grid_origin_y</font></span><span> += </span><span class="vars"><font color="#dd0000">$grid_height</font></span><span>; </span> </li> <li class="alt"><span>} </span></li> <li class=""> <span></span><span class="vars"><font color="#dd0000">$image</font></span><span>->drawImage(</span><span class="vars"><font color="#dd0000">$draw</font></span><span>); </span> </li> </ol>

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

在PHP中,可以利用implode()函数的第一个参数来设置没有分隔符,该函数的第一个参数用于规定数组元素之间放置的内容,默认是空字符串,也可将第一个参数设置为空,语法为“implode(数组)”或者“implode("",数组)”。


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