How can the correct number of lines for text be calculated in a fail-safe manner when using fpdf for PDF generation?

When using fpdf for PDF generation, calculating the correct number of lines for text can be tricky as it depends on factors such as font size, line height, and text length. To ensure a fail-safe calculation, you can divide the width of the text area by the width of a single character to estimate the number of characters per line, and then divide the total text length by this number to get the number of lines needed. 

// Sample code for calculating the number of lines for text in fpdf

$font_size = 12; // Font size in points
$line_height = 15; // Line height in points
$text_width = 100; // Width of text area in points
$text = "Lorem ipsum dolor sit amet, consectetur adipiscing elit."; // Sample text

$char_width = $pdf->GetStringWidth("A"); // Width of a single character
$chars_per_line = floor($text_width / $char_width); // Calculate number of characters per line
$total_chars = strlen($text); // Get total number of characters in text
$lines = ceil($total_chars / $chars_per_line); // Calculate number of lines needed for text

echo "Number of lines: " . $lines;

Keywords

fpdf PDF generation text lines calculation fail-safe

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