php 限定区域自动调整字体大小的类

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<?php
/**
 * php在限定的区域里自动调整字体大小的php类 imagefittext.class.php
 *
 * @param 
 * @author php教程 www.idcnote.com
 **/
// 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]; 
	} 
} 

/***   来自php教程（www.idcnote.com）   ***/

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