note 59623 deleted from function.imagettfbbox by cmb
| From: | cmb@php.net | Date: | Sun, 17 Nov 2019 08:39:43 +0000 |
| Subject: | note 59623 deleted from function.imagettfbbox by cmb | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-213086@lists.php.net to get a copy of this message | ||
Note Submitter: Mickey9801 at ComicParty dot com
----
I have revised my mb_wordwrap function to fix 2 major bugs: cannot handle line break and infinite
loop while handling very very long long long single byte word.
<?php
function mb_wordwrap($txt,$font,$size,$width) {
$pointer = 0; // Current character position pointer
$this_line_start = 0; // Starting character position of current line
$this_line_strlen = 1; // How long is the current line
$single_byte_stack = ""; // Variable for storing single byte word
$sbs_line_width = 0; // Pixel width of the Single byte word
$this_is_cr = FALSE; // Check if the character is new line code (ASCII=10)
$result_lines = array(); // Array for storing the return result
while ($pointer < mb_strlen($txt)) {
$this_char = mb_substr($txt,$pointer,1);
if (ord($this_char[0])==10) $this_is_cr = TRUE; // Check if it is a new line
// Check current line width
$tmp_line = mb_substr($txt, $this_line_start, $this_line_strlen);
$tmp_line_bbox = imagettfbbox($size,0,$font,$tmp_line);
$this_line_width = $tmp_line_bbox[2]-$tmp_line_bbox[0];
// Prevent to cut off english word at the end of line
// if this character is a alphanumeric character or open bracket, put it into stack
if (is_alphanumeric($this_char, $single_byte_stack)) $single_byte_stack .= $this_char;
// Check the width of single byte words
if ($single_byte_stack != "") {
$tmp_line_bbox = imagettfbbox($size,0,$font,$single_byte_stack);
$sbs_line_width = $tmp_line_bbox[2]-$tmp_line_bbox[0];
}
if ($this_is_cr || $this_line_width > $width || $sbs_line_width >= $width) {
// If last word is alphanumeric, put it to next line rather then cut it off
if ($single_byte_stack != "" && is_alphanumeric($this_char, $single_byte_stack)
&& $sbs_line_width < $width) {
$stack_len = mb_strlen($single_byte_stack);
$this_line_strlen = $this_line_strlen - $stack_len + 1;
$pointer = $pointer - $stack_len + 1;
}
// Move the current line to result array and reset all counter
$result_lines[] = mb_substr($txt, $this_line_start, $this_line_strlen-1);
if ($this_is_cr) { $pointer++; $this_is_cr=FALSE; }
if ($sbs_line_width >= $width) $sbs_line_width = 0;
$this_line_start = $pointer;
$this_line_strlen = 1;
$single_byte_stack = "";
} else {
if (!is_alphanumeric($this_char, $single_byte_stack)) {
$single_byte_stack = ""; // Clear stack if met multibyte character and not line end
}
$this_line_strlen++;
$pointer++;
}
}
// Move remained word to result
$result_lines[] = mb_substr($txt, $this_line_start);
return $result_lines;
}
function is_alphanumeric($character, $stack) {
if (
(ord($character)>=48 && ord($character)<=57) ||
(ord($character)>=65 && ord($character)<=91) ||
(ord($character)>=97 && ord($character)<=123) ||
ord($character)==40 ||
ord($character)==60 ||
($stack=="" && (ord($character)==34 || ord($character)==39))
) return TRUE;
else return FALSE;
}
?>