PHP ActiveX Requires Chilkat v11.7.0+

Clipped, Off-Page and White-on-White Text in PDF Extraction

See more PDF Text Extraction Examples

Demonstrates the "clippedText", "offPageText" and "obscuredText" filters. Text that a reader never sees - hidden by a clipping path, outside the crop box, or drawn in the same color as the box beneath it - is excluded by default, and the quality report notes what was skipped. Each kind can be included. PHP ActiveX

<?php

$success = 0;

//  This example requires the Chilkat API to have been previously unlocked.
//  See Global Unlock Sample for sample code.

//  The PDF used in this example is available at hidden_text.pdf

$pdf = new COM("Chilkat.Pdf");
$success = $pdf->LoadFile('qa_data/pdf/hidden_text.pdf');
if ($success == 0) {
    print $pdf->LastErrorText . "\n";
    exit;
}

$json = new COM("Chilkat.JsonObject");
$jsonOut = new COM("Chilkat.JsonObject");

//  The page has a visible paragraph plus three hidden lines: one drawn outside its clipping
//  rectangle, one below the crop box, and one in white on a white box.
$success = $pdf->ExtractText('text',$json,$jsonOut);
if ($success == 0) {
    print $pdf->LastErrorText . "\n";
    exit;
}

print '---- default ----' . "\n";
print $jsonOut->stringOf('text') . "\n";

//  The quality report says what was left out.
$i = 0;
$count_i = $jsonOut->SizeOfArray('quality.pages[0].issues');
while ($i < $count_i) {
    $jsonOut->I = $i;
    print 'issue: ' . $jsonOut->stringOf('quality.pages[0].issues[i].code') . "\n";
    $i = $i + 1;
}

//  Include everything.
$json->UpdateString('clippedText','include');
$json->UpdateString('offPageText','include');
$json->UpdateString('obscuredText','include');
$success = $pdf->ExtractText('text',$json,$jsonOut);
if ($success == 0) {
    print $pdf->LastErrorText . "\n";
    exit;
}

print '---- clippedText, offPageText, obscuredText: include ----' . "\n";
print $jsonOut->stringOf('text') . "\n";

//  Sample output:

//  ---- default ----
//  Visible Text
//  
//  This paragraph is visible. The page also carries three kinds of text a reader never sees.
//  
//  End of the visible text.
//  issue: obscuredTextSkipped
//  issue: clippedTextSkipped
//  ---- clippedText, offPageText, obscuredText: include ----
//  Visible Text
//  
//  This paragraph is visible. The page also carries three kinds of text a reader never sees.
//  
//  CLIPPED: this line is drawn outside its clipping rectangle.
//  
//  OBSCURED: this line is white on a white box.
//  
//  End of the visible text.
//  
//  OFFPAGE: this line sits below the crop box.

?>