让我们烤点甜饼(做饼图)
成功地安装了PHP地Shockwave Flash支持后,就可以用PHP创建Shockwave文件了。学习的最好方法就是直接跳到程序去,所以下面就让我们看看程序。第一个文件包括怎样使用类的示例代码,同时也显示了如何将一个Flash文件嵌入到HTML文档中。
// include class needed for flash graph
include("class.pie.flash.php");
mysql_connect ("localhost", "root", "");
$query = "SELECT DISTINCT city_name, COUNT(city_id)
FROM city
GROUP BY city_name;";
$result = mysql_db_query ("hermes",$query);
while ($row = mysql_fetch_array ($result)) {
$city_counts[] = $row["COUNT(city_id)"];
$city_names[] = $row["city_name"];
}
mysql_free_result ($result);
// Instantiate new object
$graph = new flash_pie($city_counts, "city.swf");
// set graph title (should not exceed about 25 characters)
$graph->pie_title("City Results", 30);
// set graph legend
$graph->pie_legend($city_names);
// show graph
$graph->show();
// free resources
$graph->close();
?>
class flash_pie {
// class variables
// setup some global colors
var $r_arr = array(0.1, 1, 0, 1, 0, 1, 0.388235294, 0.4, 0.388235294, 0.929411765);
var $g_arr = array(1, 0, 0, 1, 1, 0, 0.8, 0.4, 0.8, 0.439215686);
var $b_arr = array(0.25, 0, 1, 0, 1, 1, 1, 0.4, 1, 0.043137255);
var $percents;
function flash_pie($values, $this_file) { //begin constructor
// to write out code directly to browser, set content header and use "php://stdout"
//swf_openfile ("php://stdout", 700, 250, 30, 1, 1, 1);
//header("Content-type: application/x-shockwave-flash");
swf_openfile ($this_file, 1000, 450, 30, 1, 1, 1);
// set up viewport for flash movie
swf_ortho2 (-400, 300 , -90, 250);
// choose the font we will use for pie graph
swf_definefont(10, "Mod");
// get sum of array for percents/slices
while(list($key,$val) = each($values)) {
$sum = $sum + $val;
}
for ($i=0; $i
// draw all of our slices
if ($i == 0) {
// setup parameters for first slice
$begin = 0;
$val = $values[$i]/$sum;
$end = $val*360;
swf_translate(-200, 0, 0);
} else {
// setup parameters for every other slice
$begin = $end;
$val = $values[$i]/$sum;
$end = $end + $val*360;
}
// function call to add slice
$objID = 1+$i*10;
$this->show_slice($i, $objID, $begin, $end);
// put together percent array for all labels
$this->percents[$i] = round($values[$i]/$sum*100);
}
} //end flash_pie
function show_slice($i, $objID, $begin, $end) {
// draws a slice and places it in our frame
swf_addcolor($this->r_arr[$i], $this->g_arr[$i], $this->b_arr[$i], 1);
swf_startshape($objID);
swf_shapefillsolid(0, 0, 0, 1);
swf_shapearc(0, 0, 100, $begin, $end);
swf_shapecurveto(0, 0, 0, 0);
swf_endshape($objID);
swf_pushmatrix();
swf_placeobject($objID, 1);
swf_popmatrix();
swf_showframe();
}
function pie_legend($labels) {
// draws the legend and labels and places it in our frame
for ($i=0; $i
swf_definerect($i+1000, 1, 0, 20, 20, 0);
if ($i == 0) {
swf_translate(120, 75, 0);
} else {
swf_translate(0, 20, 0);
}
swf_placeobject($i+1000, 1);
swf_translate(0, 5, 0);
unset($label);
$label = $labels[$i];
$label .= " (";
$label .= $this->percents[$i];
$label .= " percent)";
if ($i==0) {
$width = (swf_textwidth($label)/4)+30;
} else {
$width = round(swf_textwidth($label)/2)+30;
}
$this->pie_text($i-1000, "$label", 15, $width, 0);
swf_translate(-$width, 0, 0);
}
swf_translate($width, 30*count($labels), 0);
}
function pie_text($id, $text, $size, $x, $y) {
// simple function to draw text ($text) at ($x,$y) with font size ($size)
// set color of text to black
swf_addcolor(0,0,0,0);
// set font size and slant
swf_fontsize($size);
swf_fontslant(0);
// define, position and place text in frame
swf_definetext($id, "$text", 1);
swf_translate($x, $y, 0);
swf_placeobject($id, 1);
}
function pie_title($text, $size) {
// simple function to draw title and set lineup
// $text should not exceed about 25 characters
$this->pie_text(99, $text, $size, 0, 150);
swf_translate(0, -300, 0);
}
function show() {
// show the frame
swf_showframe();
}
function close() {
// flush our buffer and return movie
$data = swf_closefile(1);
}
} // end class flash_pie
?>
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tomakephpapplicationsfaster,关注台词:1)useopcodeCachingLikeLikeLikeLikeLikePachetoStorePreciledScompiledScriptbyTecode.2)MinimimiedAtabaseSqueriSegrieSqueriSegeriSybysequeryCachingandeffeftExting.3)Leveragephp7 leveragephp7 leveragephp7 leveragephpphp7功能forbettercodeefficy.4)

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依赖注入(DI)通过显式传递依赖关系,显着提升了PHP代码的可测试性。 1)DI解耦类与具体实现,使测试和维护更灵活。 2)三种类型中,构造函数注入明确表达依赖,保持状态一致。 3)使用DI容器管理复杂依赖,提升代码质量和开发效率。

databasequeryOptimizationinphpinvolVolVOLVESEVERSEVERSTRATEMIESOENHANCEPERANCE.1)SELECTONLYNLYNESSERSAYCOLUMNSTORMONTOUMTOUNSOUDSATATATATATATATATATATRANSFER.3)

phpisusedforsenderemailsduetoitsbuilt-inmail()函数andsupportiveLibrariesLikePhpMailerandSwiftMailer.1)usethemail()functionforbasicemails,butithasimails.2)butithasimimitations.2)

PHP性能瓶颈可以通过以下步骤解决:1)使用Xdebug或Blackfire进行性能分析,找出问题所在;2)优化数据库查询并使用缓存,如APCu;3)使用array_filter等高效函数优化数组操作;4)配置OPcache进行字节码缓存;5)优化前端,如减少HTTP请求和优化图片;6)持续监控和优化性能。通过这些方法,可以显着提升PHP应用的性能。

依赖性注射(DI)InphpisadesignPatternthatManages和ReducesClassDeptions,增强量产生性,可验证性和Maintainability.itallowspasspassingDepentenciesLikEdenceSeconnectionSeconnectionStoclasseconnectionStoclasseSasasasasareTers,interitationApertatingAeseritatingEaseTestingEasingEaseTeStingEasingAndScalability。

cachingimprovesphpermenceByStorcyResultSofComputationsorqucrouctationsorquctationsorquickretrieval,reducingServerLoadAndenHancingResponsetimes.feftectivestrategiesinclude:1)opcodecaching,whereStoresCompiledSinmememorytssinmemorytoskipcompliation; 2)datacaching datacachingsingMemccachingmcachingmcachings


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