/**
* 生成验证码图片
*
* @param int $p_iWidth
* @param int $p_iHeight
* @param string $p_sStr
* @param int $p_iFontSize
* @param int $p_iPointDensity
* @param int $p_iCircleDensity
* @param int $p_iFontAngle
*/
static function createIdentifyCodeImage($p_iWidth, $p_iHeight, $p_sStr, $p_iFontSize = 0, $p_iPointDensity = 0, $p_iCircleDensity = 0, $p_iFontAngle = 0)
{
// 获取各种默认值
$sTextFont = Util_Common::getConfig('sImgFont');
if (0 == $p_iFontSize) {
$p_iFontSize = round($p_iHeight * 3 / 5);
}
if (0 == $p_iPointDensity) {
$p_iPointDensity = round($p_iHeight * $p_iWidth / 100);
}
if (0 == $p_iCircleDensity) {
$p_iCircleDensity = round($p_iHeight * $p_iWidth / 200);
}
// 生成画布
$oImg = imagecreatetruecolor($p_iWidth, $p_iHeight);
// 填充颜色
$bgc = imagecolorallocate($oImg, 255, 255, 255);
imagefill($oImg, 0, 0, $bgc);
// 获取字体范围大小
$aTextSize = imagettfbbox($p_iFontSize, $p_iFontAngle, $sTextFont, $p_sStr);
$iTextHeight = max($aTextSize[1], $aTextSize[3]) - min($aTextSize[5], $aTextSize[7]);
$iTextWidth = max($aTextSize[4], $aTextSize[2]) - min($aTextSize[0], $aTextSize[6]);
// 字体起始位置
$iTextStartLeft = ($p_iWidth - $iTextWidth) / 2;
$iTextStartHeight = $p_iHeight / 2 + $iTextHeight / 2;
// 字体颜色
$colors = [[0, 10, 210], [24, 157, 10], [177, 70, 20]];
$colorsValue = $colors[array_rand($colors)];
$oTextColor = imagecolorallocate($oImg, $colorsValue[0], $colorsValue[1], $colorsValue[2]);
// 往画布上画字符串
// imagettftext($oImg, $p_iFontSize, $p_iFontAngle, $iTextStartLeft, $iTextStartHeight, $oTextColor, $sTextFont, $p_sStr);
$len = strlen($p_sStr);
$_x = ($p_iWidth - 40) / $len;
for ($i = 0; $i < $len; $i++) {
$iTextStartLeft = $_x * $i + mt_rand(20, 25);
imagettftext($oImg, $p_iFontSize, mt_rand(-10, 10), $iTextStartLeft, $iTextStartHeight, $oTextColor, $sTextFont, $p_sStr[$i]);
}
for ($i = 0; $i < 100; $i++) {
$color = imagecolorallocate($oImg, rand(50, 220), rand(50, 220), rand(50, 220));
imagesetpixel($oImg, rand(0, $p_iWidth), rand(0, $p_iHeight), $color);
}
// 往画布上画线条
for ($i = 0; $i < 5; $i++) {
$color = imagecolorallocate($oImg, mt_rand(0, 156), mt_rand(0, 156), mt_rand(0, 156));
imageline($oImg, mt_rand(0, $p_iWidth), mt_rand(0, $p_iHeight), mt_rand(0, $p_iWidth), mt_rand(0, $p_iHeight), $color);
}
ob_start();
imagegif($oImg);
$blImage = ob_get_contents();
ob_end_clean();
imagedestroy($oImg);
return $blImage;
}