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<?php
namespace B2\Modules\Common;
class Poster
{
/**
* 从图片文件创建Image资源
* @param $file 图片文件，支持url
* @return bool|resource 成功返回图片image资源，失败返回false
*/
public static function createImageFromFile($file)
{
if (preg_match('/http(s)?:\/\//', $file)) {
$fileSuffix = self::getNetworkImgType($file);
} else {
$fileSuffix = pathinfo($file, PATHINFO_EXTENSION);
}
if (!$fileSuffix)
return false;
switch ($fileSuffix) {
case 'jpeg':
$theImage = @imagecreatefromjpeg($file);
break;
case 'jpg':
$theImage = @imagecreatefromjpeg($file);
break;
case 'png':
$theImage = @imagecreatefrompng($file);
break;
case 'gif':
$theImage = @imagecreatefromgif($file);
break;
default:
$theImage = @imagecreatefromstring(file_get_contents($file));
break;
}
return $theImage;
}
/**
* 分行连续截取字符串
* @param $str 需要截取的字符串,UTF-8
* @param int $row 截取的行数
* @param int $number 每行截取的字数，中文长度
* @param bool $suffix 最后行是否添加‘...’后缀
* @return array 返回数组共$row个元素，下标1到$row
*/
public static function cn_row_substr($str, $row = 1, $number = 10, $suffix = true)
{
$result = array();
for ($r = 1; $r <= $row; $r++) {
$result[$r] = '';
}
$str = trim($str);
if (!$str)
return $result;
$theStrlen = strlen($str);
//每行实际字节长度
$oneRowNum = $number * 3;
for ($r = 1; $r <= $row; $r++) {
if ($r == $row and $theStrlen > $r * $oneRowNum and $suffix) {
$result[$r] = self::mg_cn_substr($str, $oneRowNum - 15, ($r - 1) * $oneRowNum) . '...';
} else {
$result[$r] = self::mg_cn_substr($str, $oneRowNum, ($r - 1) * $oneRowNum);
}
if ($theStrlen < $r * $oneRowNum)
break;
}
return $result;
}
public static function autoLineSplit($str, $fontFamily, $fontSize, $charset, $width, $line)
{
$result = [];
$len = (strlen($str) + mb_strlen($str, $charset)) / 2;
// 计算总占宽
$dimensions = imagettfbbox($fontSize, 0, $fontFamily, $str);
$textWidth = abs($dimensions[4] - $dimensions[0]);
// 计算每个字符的长度
$singleW = $textWidth / $len;
// 计算每行最多容纳多少个字符
$maxCount = floor($width / $singleW);
$i = 1;
while ($len > $maxCount) {
if ($i > $line)
break;
if ($i == $line) {
// 成功取得一行
$result[] = mb_strimwidth($str, 0, $maxCount - 3, '', $charset) . '...';
} else {
// 成功取得一行
$result[] = mb_strimwidth($str, 0, $maxCount, '', $charset);
}
// 移除上一行的字符
$str = str_replace($result[count($result) - 1], '', $str);
// 重新计算长度
$len = (strlen($str) + mb_strlen($str, $charset)) / 2;
$i++;
}
// 最后一行在循环结束时执行
$result[] = $str;
return $result;
}
/**
* 按字节截取utf-8字符串
* 识别汉字全角符号，全角中文3个字节，半角英文1个字节
* @param $str 需要切取的字符串
* @param $len 截取长度[字节]
* @param int $start 截取开始位置，默认0
* @return string
*/
public static function mg_cn_substr($str, $len, $start = 0)
{
$q_str = '';
$q_strlen = ($start + $len) > strlen($str) ? strlen($str) : ($start + $len);
//如果start不为起始位置，若起始位置为乱码就按照UTF-8编码获取新start
if ($start and json_encode(substr($str, $start, 1)) === false) {
for ($a = 0; $a < 3; $a++) {
$new_start = $start + $a;
$m_str = substr($str, $new_start, 3);
if (json_encode($m_str) !== false) {
$start = $new_start;
break;
}
}
}
//切取内容
for ($i = $start; $i < $q_strlen; $i++) {
//ord()函数取得substr()的第一个字符的ASCII码，如果大于0xa0的话则是中文字符
if (ord(substr($str, $i, 1)) > 0xa0) {
$q_str .= substr($str, $i, 3);
$i += 2;
} else {
$q_str .= substr($str, $i, 1);
}
}
return $q_str;
}
}