PHP Code to Extract Text and Images from a PDF file

Extract Text and Images from a PDF
It has been a deadly felt need for a code to extract the text and images from a PDF file. Though there has been online tools that convert PDF files into text and other formats, But there had been no programming solution to extract the content from a PDF file, until a useful class added to PHP named “class.pdf2text.php”.

Extract Text and Images from a PDF file Using PHP

With this class, one can not only get and use the content of a PDF file in a web application, but also this class gives user the facility to determine the presence of a specific text string inside the PDF file.

Here is the class file code “class.pdf2text.php”. Include this file in each example.

<?php
/*
SYNTAX:
include('class.pdf2text.php');
$a = new PDF2Text();
$a->setFilename('test.pdf');
$a->decodePDF();
echo $a->output();

ALTERNATIVES:
Other excellent options to search within a PDF:
- Apache PDFbox (http://pdfbox.apache.org/). An open source Java solution
- pdflib TET (http://www.pdflib.com/products/tet/)
- Online converter: http://snowtide.com/PDFTextStream
*/

class PDF2Text {
	// Some settings
	var $multibyte = 4; // Use setUnicode(TRUE|FALSE)
	var $convertquotes = ENT_QUOTES; // ENT_COMPAT (double-quotes), ENT_QUOTES (Both), ENT_NOQUOTES (None)
	var $showprogress = true; // TRUE if you have problems with time-out

	// Variables
	var $filename = '';
	var $decodedtext = '';

	function setFilename($filename) {
		// Reset
		$this->decodedtext = '';
		$this->filename = $filename;
	}

	function output($echo = false) {
		if($echo) echo $this->decodedtext;
		else return $this->decodedtext;
	}

	function setUnicode($input) {
		// 4 for unicode. But 2 should work in most cases just fine
		if($input == true) $this->multibyte = 4;
		else $this->multibyte = 2;
	}

	function decodePDF() {
		// Read the data from pdf file
		$infile = @file_get_contents($this->filename, FILE_BINARY);
		if (empty($infile))
			return "";

		// Get all text data.
		$transformations = array();
		$texts = array();

		// Get the list of all objects.
		preg_match_all("#obj[\n|\r](.*)endobj[\n|\r]#ismU", $infile . "endobj\r", $objects);
		$objects = @$objects[1];

		// Select objects with streams.
		for ($i = 0; $i < count($objects); $i++) {
			$currentObject = $objects[$i];

			// Prevent time-out
			@set_time_limit ();
			if($this->showprogress) {
//				echo ". ";
				flush(); ob_flush();
			}

			// Check if an object includes data stream.
			if (preg_match("#stream[\n|\r](.*)endstream[\n|\r]#ismU", $currentObject . "endstream\r", $stream )) {
				$stream = ltrim($stream[1]);
				// Check object parameters and look for text data.
				$options = $this->getObjectOptions($currentObject);

				if (!(empty($options["Length1"]) && empty($options["Type"]) && empty($options["Subtype"])) )
//				if ( $options["Image"] && $options["Subtype"] )
//				if (!(empty($options["Length1"]) &&  empty($options["Subtype"])) )
					continue;

				// Hack, length doesnt always seem to be correct
				unset($options["Length"]);

				// So, we have text data. Decode it.
				$data = $this->getDecodedStream($stream, $options);

				if (strlen($data)) {
	                if (preg_match_all("#BT[\n|\r](.*)ET[\n|\r]#ismU", $data . "ET\r", $textContainers)) {
						$textContainers = @$textContainers[1];
						$this->getDirtyTexts($texts, $textContainers);
					} else
						$this->getCharTransformations($transformations, $data);
				}
			}
		}

		// Analyze text blocks taking into account character transformations and return results.
		$this->decodedtext = $this->getTextUsingTransformations($texts, $transformations);
	}


	function decodeAsciiHex($input) {
		$output = "";

		$isOdd = true;
		$isComment = false;

		for($i = 0, $codeHigh = -1; $i < strlen($input) && $input[$i] != '>'; $i++) {
			$c = $input[$i];

			if($isComment) {
				if ($c == '\r' || $c == '\n')
					$isComment = false;
				continue;
			}

			switch($c) {
				case '\0': case '\t': case '\r': case '\f': case '\n': case ' ': break;
				case '%':
					$isComment = true;
				break;

				default:
					$code = hexdec($c);
					if($code === 0 && $c != '0')
						return "";

					if($isOdd)
						$codeHigh = $code;
					else
						$output .= chr($codeHigh * 16 + $code);

					$isOdd = !$isOdd;
				break;
			}
		}

		if($input[$i] != '>')
			return "";

		if($isOdd)
			$output .= chr($codeHigh * 16);

		return $output;
	}

	function decodeAscii85($input) {
		$output = "";

		$isComment = false;
		$ords = array();

		for($i = 0, $state = 0; $i < strlen($input) && $input[$i] != '~'; $i++) {
			$c = $input[$i];

			if($isComment) {
				if ($c == '\r' || $c == '\n')
					$isComment = false;
				continue;
			}

			if ($c == '\0' || $c == '\t' || $c == '\r' || $c == '\f' || $c == '\n' || $c == ' ')
				continue;
			if ($c == '%') {
				$isComment = true;
				continue;
			}
			if ($c == 'z' && $state === 0) {
				$output .= str_repeat(chr(0), 4);
				continue;
			}
			if ($c < '!' || $c > 'u')
				return "";

			$code = ord($input[$i]) & 0xff;
			$ords[$state++] = $code - ord('!');

			if ($state == 5) {
				$state = 0;
				for ($sum = 0, $j = 0; $j < 5; $j++)
					$sum = $sum * 85 + $ords[$j];
				for ($j = 3; $j >= 0; $j--)
					$output .= chr($sum >> ($j * 8));
			}
		}
		if ($state === 1)
			return "";
		elseif ($state > 1) {
			for ($i = 0, $sum = 0; $i < $state; $i++)
				$sum += ($ords[$i] + ($i == $state - 1)) * pow(85, 4 - $i);
			for ($i = 0; $i < $state - 1; $i++) {
				try {
					if(false == ($o = chr($sum >> ((3 - $i) * 8)))) {
						throw new Exception('Error');
					}
					$output .= $o;
				} catch (Exception $e) { /*Dont do anything*/ }
			}
		}

		return $output;
	}

	function decodeFlate($data) {
		return @gzuncompress($data);
	}

	function getObjectOptions($object) {
		$options = array();

		if (preg_match("#<<(.*)>>#ismU", $object, $options)) {
			$options = explode("/", $options[1]);
			@array_shift($options);

			$o = array();
			for ($j = 0; $j < @count($options); $j++) {
				$options[$j] = preg_replace("#\s+#", " ", trim($options[$j]));
				if (strpos($options[$j], " ") !== false) {
					$parts = explode(" ", $options[$j]);
					$o[$parts[0]] = $parts[1];
				} else
					$o[$options[$j]] = true;
			}
			$options = $o;
			unset($o);
		}

		return $options;
	}

	function getDecodedStream($stream, $options) {
		$data = "";
		if (empty($options["Filter"]))
			$data = $stream;
		else {
			$length = !empty($options["Length"]) ? $options["Length"] : strlen($stream);
			$_stream = substr($stream, 0, $length);

			foreach ($options as $key => $value) {
				if ($key == "ASCIIHexDecode")
					$_stream = $this->decodeAsciiHex($_stream);
				elseif ($key == "ASCII85Decode")
					$_stream = $this->decodeAscii85($_stream);
				elseif ($key == "FlateDecode")
					$_stream = $this->decodeFlate($_stream);
				elseif ($key == "Crypt") { // TO DO
				}
			}
			$data = $_stream;
		}
		return $data;
	}

	function getDirtyTexts(&$texts, $textContainers) {
		for ($j = 0; $j < count($textContainers); $j++) {
			if (preg_match_all("#\[(.*)\]\s*TJ[\n|\r]#ismU", $textContainers[$j], $parts))
				$texts = array_merge($texts, array(@implode('', $parts[1])));
			elseif (preg_match_all("#T[d|w|m|f]\s*(\(.*\))\s*Tj[\n|\r]#ismU", $textContainers[$j], $parts))
				$texts = array_merge($texts, array(@implode('', $parts[1])));
			elseif (preg_match_all("#T[d|w|m|f]\s*(\[.*\])\s*Tj[\n|\r]#ismU", $textContainers[$j], $parts))
				$texts = array_merge($texts, array(@implode('', $parts[1])));
		}

	}

	function getCharTransformations(&$transformations, $stream) {
		preg_match_all("#([0-9]+)\s+beginbfchar(.*)endbfchar#ismU", $stream, $chars, PREG_SET_ORDER);
		preg_match_all("#([0-9]+)\s+beginbfrange(.*)endbfrange#ismU", $stream, $ranges, PREG_SET_ORDER);

		for ($j = 0; $j < count($chars); $j++) {
			$count = $chars[$j][1];
			$current = explode("\n", trim($chars[$j][2]));
			for ($k = 0; $k < $count && $k < count($current); $k++) {
				if (preg_match("#<([0-9a-f]{2,4})>\s+<([0-9a-f]{4,512})>#is", trim($current[$k]), $map))
					$transformations[str_pad($map[1], 4, "0")] = $map[2];
			}
		}
		for ($j = 0; $j < count($ranges); $j++) {
			$count = $ranges[$j][1];
			$current = explode("\n", trim($ranges[$j][2]));
			for ($k = 0; $k < $count && $k < count($current); $k++) {
				if (preg_match("#<([0-9a-f]{4})>\s+<([0-9a-f]{4})>\s+<([0-9a-f]{4})>#is", trim($current[$k]), $map)) {
					$from = hexdec($map[1]);
					$to = hexdec($map[2]);
					$_from = hexdec($map[3]);

					for ($m = $from, $n = 0; $m <= $to; $m++, $n++)
						$transformations[sprintf("%04X", $m)] = sprintf("%04X", $_from + $n);
				} elseif (preg_match("#<([0-9a-f]{4})>\s+<([0-9a-f]{4})>\s+\[(.*)\]#ismU", trim($current[$k]), $map)) {
					$from = hexdec($map[1]);
					$to = hexdec($map[2]);
					$parts = preg_split("#\s+#", trim($map[3]));

					for ($m = $from, $n = 0; $m <= $to && $n < count($parts); $m++, $n++)
						$transformations[sprintf("%04X", $m)] = sprintf("%04X", hexdec($parts[$n]));
				}
			}
		}
	}
	function getTextUsingTransformations($texts, $transformations) {
		$document = "";
		for ($i = 0; $i < count($texts); $i++) {
			$isHex = false;
			$isPlain = false;

			$hex = "";
			$plain = "";
			for ($j = 0; $j < strlen($texts[$i]); $j++) {
				$c = $texts[$i][$j];
				switch($c) {
					case "<":
						$hex = "";
						$isHex = true;
                        $isPlain = false;
					break;
					case ">":
						$hexs = str_split($hex, $this->multibyte); // 2 or 4 (UTF8 or ISO)
						for ($k = 0; $k < count($hexs); $k++) {

							$chex = str_pad($hexs[$k], 4, "0"); // Add tailing zero
							if (isset($transformations[$chex]))
								$chex = $transformations[$chex];
							$document .= html_entity_decode("&#x".$chex.";");
						}
						$isHex = false;
					break;
					case "(":
						$plain = "";
						$isPlain = true;
                        $isHex = false;
					break;
					case ")":
						$document .= $plain;
						$isPlain = false;
					break;
					case "\\":
						$c2 = $texts[$i][$j + 1];
						if (in_array($c2, array("\\", "(", ")"))) $plain .= $c2;
						elseif ($c2 == "n") $plain .= '\n';
						elseif ($c2 == "r") $plain .= '\r';
						elseif ($c2 == "t") $plain .= '\t';
						elseif ($c2 == "b") $plain .= '\b';
						elseif ($c2 == "f") $plain .= '\f';
						elseif ($c2 >= '0' && $c2 <= '9') {
							$oct = preg_replace("#[^0-9]#", "", substr($texts[$i], $j + 1, 3));
							$j += strlen($oct) - 1;
							$plain .= html_entity_decode("&#".octdec($oct).";", $this->convertquotes);
						}
						$j++;
					break;

					default:
						if ($isHex)
							$hex .= $c;
						elseif ($isPlain)
							$plain .= $c;
					break;
				}
			}
			$document .= "\n";
		}

		return $document;
	}
}
?>

For ease, I am giving here three example using this class, as follows:

pdf_to_text.php

To Extract the Content from PDF a file

In this example extract the text from a PDF file. Create a ‘pdf_to_text.php’ file and include ‘class.pdf2text.php’ to execute library functions.

<?php
	include ( 'class.pdf2text.php' ) ;

	function  output ( $message )
	   {
		if  ( php_sapi_name ( )  ==  'cli' )
			echo ( $message ) ;
		else
			echo ( nl2br ( $message ) ) ;
	    }

	$file	=  'sample' ; // name of pdf file without .pdf extenstion, sample.pdf
	$pdf	=  new PdfToText ( "$file.pdf" ) ;

	
	output ( "Extracted file contents :\n" ) ;
	output ( $pdf -> Text ) ;
?>

pdf_to_image.php

To Extract the Embedded Image(if any) Available in The Source PDF file.

This example belong to extract an image from any source PDF file.

<?php
	// This example saves all images found in the 'sample.pdf' file, after having put the string
	// "Hello world" in blue color, using the largest stock font
	include ( 'class.pdf2text.php' ) ;

	function  output ( $message )
	   {
		if  ( php_sapi_name ( )  ==  'cli' )
			echo ( $message ) ;
		else
			echo ( nl2br ( $message ) ) ;
	    }

	$file		=  'sample' ; // name of pdf file without .pdf extenstion, sample.pdf
	$pdf		=  new PdfToText ( "$file.pdf", PdfToText::PDFOPT_DECODE_IMAGE_DATA ) ;
	$image_count 	=  count ( $pdf -> Images ) ;
	
	if  ( $image_count )
	   {
		for  ( $i = 0 ; $i  <  $image_count ; $i ++ )
		   {
			// Get next image and generate a filename for it (there will be a file named "sample.x.jpg"
			// for each image found in file "sample.pdf")
			$img		=  $pdf -> Images [$i] ;			// This is an object of type PdfImage
			$imgindex 	=  sprintf ( "%02d", $i + 1 ) ;
			$output_image	=  "$file.$imgindex.jpg" ;
			
			// Allocate a color entry for "white". Note that the ImageResource property of every PdfImage object
			// is a real image resource that can be specified to any of the image*() Php functions
			$textcolor	=  imagecolorallocate ( $img -> ImageResource, 0, 0, 255 ) ;
			
			// Put the string "Hello world" on top of the image. 
			imagestring ( $img -> ImageResource, 5, 0, 0, "Hello world #$imgindex", $textcolor ) ;
			
			// Save the image (the default is IMG_JPG, but you can specify another IMG_* image type by specifying it
			// as the second parameter)
			$img -> SaveAs ( $output_image ) ;
			
			output ( "Generated image file \"$output_image\"" ) ;
		    }
	    }
	else
		echo "No image was found in sample file \"$file.pdf\"" ;

search_pdf.php :

To Search a String in PDF file

If you are looking to search any specific text or string from a PDF file than below is example for it.

<?php
	include ( 'class.pdf2text.php' ) ;


	$file	=  'sample' ; // name of pdf file without .pdf extenstion, sample.pdf
	$pdf	=  new PdfToText ( "file.pdf" ) ;

	
	$search = 'john'; // keyword to search goes here 
	 
	    $result		=  $pdf -> text_strpos  ( $search, $start = 0 ) ; // $start is the start offset in the pdf text contents
	    
   echo "<pre>";
print_r($result); // the result will give you the position of searched string and thus indicating its presence in PDF file
?>

Many web applications need to use PDF document data for further usage. Using these PHP class you can easily get text and images from the PDF file and use it. If find this post useful, please share with others. Thanks

Download Script

2 Comments

Russ says:
October 27, 2016 at 4:59 pm
Hi, I need to scrape/copy all the data from a section of a PDF page that looks like this: http://prntscr.com/czngo4
I want to take all the variable values in that table and put them into a mysql database. Is this something you could give me a quote to do?
Harish says:
October 27, 2016 at 5:31 pm
Hi,
Yes, i will give my service for your task. You need only red highlighted part data or complete pdf text data ?
Please send your complete requirement on [email protected].
Thanks

PHP Code to Extract Text and Images from a PDF file

Extract Text and Images from a PDF file Using PHP

pdf_to_text.php

To Extract the Content from PDF a file

pdf_to_image.php

To Extract the Embedded Image(if any) Available in The Source PDF file.

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Extract Text and Images from a PDF file Using PHP

pdf_to_text.php

To Extract the Content from PDF a file

pdf_to_image.php

To Extract the Embedded Image(if any) Available in The Source PDF file.

You May Also Like:

search_pdf.php :

To Search a String in PDF file

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2 Comments

Leave a Reply Cancel reply

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