本文实例讲述了php实现在限定区域里自动调整字体大小的类。分享给大家供大家参考。具体如下:
这里的php类imagefittext.class.php实现在限定的区域里自动调整字体大小的功能。
<?php // Image Fit Text Class 0.1 by ming0070913 CLASS ImageFitText{ public $font, $fontsize, $width, $height; public $step_wrap, $step_fontsize; public function __construct($font, $step_wrap=1, $step_fontsize=1){ $this->font = $font; $this->step_wrap = $step_wrap>1?$step_wrap:1; $this->step_fontsize = $step_fontsize>1?$step_fontsize:1; } function fit($width, $height, $text, $fontsize, $min_fontsize=5, $min_wraplength=0){ $this->fontsize = & $fontsize; $text_ = $text; while($this->TextHeight($text_)>$height && $fontsize>$min_fontsize) $fontsize -= $this->step_fontsize; while(($this->TextWidth($text_)>$width || $this->TextHeight($text_)>$height) && $fontsize>$min_fontsize){ $fontsize -= $this->step_fontsize; $wraplength = $this->maxLen($text); $text_ = $text; while($this->TextWidth($text_)>$width && $wraplength>=$min_wraplength+$this->step_wrap){ $wraplength -= $this->step_wrap; $text_ = wordwrap($text, $wraplength, "\n", true); //To speed up: if($this->TextHeight($text_)>$height) break; if($wraplength<=$min_wraplength) break; $wraplength_ = $wraplength; $wraplength = ceil($wraplength/($this->TextWidth($text_)/$width)); $wraplength = $wraplength<($min_wraplength+$this->step_wrap)?($min_wraplength+$this->step_wrap):$wraplength; } } $this->width = $this->TextWidth($text_); $this->height = $this->TextHeight($text_); return array("fontsize"=>$fontsize, "text"=>$text_, "width"=>$this->width, "height"=>$this->height); } function maxLen($text){ $lines = explode("\n", str_replace("\r", "", $text)); foreach($lines as $line) $t[] = strlen($line); return max($t); } function TextWidth($text){ $t = imagettfbbox($this->fontsize, 0, $this->font, $text); return $t[2]-$t[0]; } function TextHeight($text){ $t = imagettfbbox($this->fontsize, 0, $this->font, $text); return $t[1]-$t[7]; } } ?>
使用范例如下:
<?php // Image Fit Text Class 0.1 by ming0070913 // Example File include "imagefittext.class.php"; // Settings : // The text $text = "PHP is a widely-used general-purpose scripting language that is especially suited for Web development and can be embedded into HTML. If you are new to PHP and want to get some idea of how it works, try the introductory tutorial. After that, check out the online manual."; // The maximun width $width = 200; // The maximun height $height = 100; // Position of the text and the box $x1 = 50; $y1 = 50; // The starting font size $fontsize = 10; // The minimun font size. The script will stop if it cannot fit the text even with this size. $min_fontsize = 3; // The minimun wrap length for each line. The script will try another font size if it cannot fit the text even with this wrap length. $min_wraplength = 0; // The font $font = "arial.ttf"; // The space between the box and the text. It's independent to the script which can be ignored $padding = 3; // If the script cannot fit the text for certain wrap length, it will try the wrap length again with the reduction in this value. // It reduce the accuracy, but will slightly speed up the process. $step_wrap = 1; // If the script cannot fit the text for certain font size, it will try the the font size again with the reduction in this value. // It reduce the accuracy, but will slightly speed up the process. $step_fontsize = 1; // Create a image $im = @imagecreatetruecolor($width+$x1*2, $height+$y1*2+80) or die('Cannot Initialize new GD image stream'); // Start the timer $time_start = microtime_float(); // The class $imagefittext = new ImageFitText($font, $step_wrap, $step_fontsize); // Fit the text // It returns the result in a array with "fontsize", "text", "width", "height" $fit = $imagefittext->fit($width-$padding*2, $height-$padding*2, $text, $fontsize, $min_fontsize, $min_wraplength); // Stop the timer $time = round(microtime_float()-$time_start, 3); $white = imagecolorallocate($im, 255, 255, 255); // Draw a box imagerectangle($im, $x1, $y1, $x1+$width, $y1+$height, $white); // Write the text +8 because the text will move up originally imagettftext($im, $fit['fontsize'], 0, $x1+$padding, $y1+$padding+8, $white, $font, $fit['text']); // Print some info. about the text imagestring($im, 5, $x1, $y1+$height+30, 'Fontsize : '.$fit['fontsize'], $white); imagestring($im, 5, $x1, $y1+$height+45, 'Text Size : '.$fit['width']."x".$fit['height'], $white); imagestring($im, 5, $x1, $y1+$height+60, 'Box Size : '.($width-$padding*2)."x".($height-$padding*2), $white); imagestring($im, 5, $x1, $y1+$height+75, 'Time used : '.$time.'s', $white); // Print the image header ('Content-Type: image/png'); imagepng($im); imagedestroy($im); function microtime_float(){ // Timer list($usec, $sec) = explode(" ", microtime()); return ((float)$usec + (float)$sec); } ?>
希望本文所述对大家的php程序设计有所帮助。

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。

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,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。

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。


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