Question

我有一位客户希望确定通过网络表单输入的字符串的长度。字符串的情况可能是混合的。

假设字体大小为1＆＃34;高度，即。约。 72分。

72分，小写＆＃39;印刷品比大写字母窄......＆＃39;

我需要以英寸显示结果。

PHP中有没有办法计算字符串的宽度？

Answer 1

您需要抓取文本，并使用正确大小的字体将其转换为图像，等等。感谢使用php并不是太多的任务。对于这种情况，我将假设有关字体等的一些细节，但请使用您自己的数据。

   <?php
    $text = "my string of text";

    $img = $imagecreatetruecolor(100,100); // SIZE DOESN'T MATTER REALLY THIS TIME
    $fontSize = 72; //FONT SIZE
    $fontFile = "arial.ttf" // PUT THE RELEVANT FONT FILE IN THE SAME DIRECTORY AS THIS SCRIPT
    $boundingBox = imagettfbbox($fontSize, 0, $fontFile, $text); //RETRIEVE THE BOUNDING BOX OF THE TEXT RENDERED
    $width = $boundingBox[2] - $boundingBox[0]; //WIDTH IN PIXELS AT 72dpi
    $inchesWidth = $width/72;
    echo $inchesWidth;
    ?>

由于系统之间的间距不同，它不会100％准确，但应该给你一个很好的猜测。

Answer 2

这在 Unicode 标准附件 #11 中被引用东亚宽度，所以我们要解析如下文件：

# Unicode Character Database
# For documentation, see http://www.unicode.org/reports/tr44/
#
# East_Asian_Width Property
#
# This file is a normative contributory data file in the
# Unicode Character Database.
#
# The format is two fields separated by a semicolon.
# Field 0: Unicode code point value or range of code point values
# Field 1: East_Asian_Width property, consisting of one of the following values:
#         "A", "F", "H", "N", "Na", "W"

00AB;N           # Pi         LEFT-POINTING DOUBLE ANGLE QUOTATION MARK
00AC;Na          # Sm         NOT SIGN
00AD;A           # Cf         SOFT HYPHEN
00AE;A           # So         REGISTERED SIGN
00AF;Na          # Sk         MACRON
00B0;A           # So         DEGREE SIGN
00B1;A           # Sm         PLUS-MINUS SIGN
00B2..00B3;A     # No     [2] SUPERSCRIPT TWO..SUPERSCRIPT THREE
00B4;A           # Sk         ACUTE ACCENT
00B5;N           # Ll         MICRO SIGN
00B6..00B7;A     # Po     [2] PILCROW SIGN..MIDDLE DOT
(...)

http://www.unicode.org/Public/UCD/latest/ucd/EastAsianWidth.txt

http://www.unicode.org/reports/tr11/tr11-38.html

PHP - 如何确定字符串的宽度

2 个答案: