PHP Requires Chilkat v11.7.0+

Replace the Value After a Label in a PDF (Re-issue an Invoice)

See more PDF Text Replacement Examples

Demonstrates replacing the values that follow labels such as "Invoice Number:" on a PDF that has no placeholders -- an ordinary invoice. Each entry of the "labels" array names a label as it appears on the page and the new value; the value replaces the rest of the label's line. Label matching ignores case, extra spaces and a trailing colon. The replaced text is read back with ExtractText to confirm it. Chilkat2 PHP

<?php

use Chilkat2\JsonObject;
use Chilkat2\Pdf;

$success = false;

// 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 invoice_labels.pdf

$pdf = new Pdf();
try {
    $pdf->LoadFile('qa_data/pdf/invoice_labels.pdf');
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

// The invoice has lines such as "Invoice Number:   INV-2026-0412" and "Total Due:  $1,234.53".
// Each label's new value replaces whatever follows the label on its line.
$json = new JsonObject();
$json->UpdateString('labels[0].label', 'Invoice Number:');
$json->UpdateString('labels[0].value', 'INV-2026-0500');
$json->UpdateString('labels[1].label', 'Invoice Date:');
$json->UpdateString('labels[1].value', 'April 2, 2026');
$json->UpdateString('labels[2].label', 'customer');
$json->UpdateString('labels[2].value', 'Contoso Ltd');
$json->UpdateString('labels[3].label', 'Total Due:');
$json->UpdateString('labels[3].value', '$1,999.99');

$jsonOut = new JsonObject();
try {
    $pdf->TextReplace('apply', $json, $jsonOut);
    $success = true;
} catch (\Chilkat2\Exception $e) {
    $success = false;
}
if (!$success) {
    echo 'Not applied: ', $jsonOut->Emit(), "\n";
    if (!$success) {
        echo $pdf->LastErrorText, "\n";
        exit;
    }
}

$i = 0;
$count_i = $jsonOut->SizeOfArray('replacements');
while ($i < $count_i) {
    $jsonOut->I = $i;
    echo 'Replaced the value of "', $jsonOut->StringOf('replacements[i].label'), '" on page ', $jsonOut->StringOf('replacements[i].pages'), "\n";
    $i = $i + 1;
}

try {
    $pdf->WriteFile('qa_output/invoice_reissued.pdf');

    // Read the new values back with ExtractText's label option.
    $jsonRead = new JsonObject();
    $jsonText = new JsonObject();
    $jsonRead->UpdateString('label', 'Total Due');
    $jsonRead->UpdateString('labelValue', 'right');
    $pdf->ExtractText('text', $jsonRead, $jsonText);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo 'Total Due is now: ', $jsonText->StringOf('text'), "\n";

// Sample output:

// Replaced the value of "Invoice Number:" on page 1
// Replaced the value of "Invoice Date:" on page 1
// Replaced the value of "customer" on page 1
// Replaced the value of "Total Due:" on page 1
// Total Due is now: $1,999.99