How to use PHP to implement electronic signature and contract management functions

How to use PHP to implement electronic signature and contract management functions

Introduction:
In the digital era, traditional paper contracts can no longer meet the requirements of speed, safety and convenience needs. Electronic signature and contract management capabilities can effectively solve this problem. This article will introduce how to use PHP language to implement electronic signature and contract management functions, and use code examples to help readers get started quickly.

1. Implementation of electronic signature function

1. Generate signature image
   In PHP, you can use the GD library to generate a signature image. The following is a sample code:

$signatureText = "John Doe";
$imageWidth = 200;
$imageHeight = 100;

$signatureImage = imagecreatetruecolor($imageWidth, $imageHeight);
$backgroundColor = imagecolorallocate($signatureImage, 255, 255, 255);
$textColor = imagecolorallocate($signatureImage, 0, 0, 0);

imagefill($signatureImage, 0, 0, $backgroundColor);
imagettftext($signatureImage, 20, 0, 10, 50, $textColor, "path/to/font.ttf", $signatureText);

imagepng($signatureImage, "path/to/signature.png");
imagedestroy($signatureImage);

In the above code, first set the width and height of the signature text and image. Then create a true color image object and set the background color and text color. Use the imagefill method to fill the background color, and then use the imagettftext method to write the signature text into the image. Finally, use the imagepng method to save the signature image to the specified path, and use the imagedestroy method to destroy the image object.

2. Verify signature
   In order to ensure the authenticity of the signature, the public key and private key can be used to encrypt and decrypt the signature. The following is a sample code:

$signature = "path/to/signature.png";
$publicKey = "path/to/public_key.pem";
$data = "Some data to sign";

$publicKeyResource = openssl_pkey_get_public(file_get_contents($publicKey));
$signatureData = base64_decode(file_get_contents($signature));

$result = openssl_verify($data, $signatureData, $publicKeyResource);
if ($result == 1) {
    echo "Signature verified!";
} else {
    echo "Signature verification failed!";
}

openssl_free_key($publicKeyResource);

In the above code, first specify the path of the signature image, the path of the public key and the data to be verified. Then use the openssl_pkey_get_public method to obtain the public key resource, and then use the base64_decode method to decode the signature data. Then use the openssl_verify method to verify the data. If the verification is successful, the return value is 1, otherwise it is 0. Finally, use the openssl_free_key method to release the public key resource.

2. Implementation of the contract management function

1. Contract creation
   Contract creation mainly includes steps such as contract template selection and filling in contract-related information. The following is a sample code:

$templateId = $_POST['template_id'];
$contractTitle = $_POST['title'];
$content = $_POST['content'];

// 将合同数据保存到数据库或其他存储方式

echo "Contract created successfully!";

In the above code, information such as the selected contract template ID, contract title, and contract content can be obtained through $_POST. Then save the contract data to a database or other storage method, and return a prompt message indicating successful creation.

2. Contract signing
   Contract signing requires verification of the identity and signature of the signer, and signing can only be carried out after the verification is passed. The following is a sample code:

$contractId = $_GET['contract_id'];
$signature = $_FILES['signature'];

// 验证签署人身份和签名

// 将签署信息保存到数据库或其他存储方式

echo "Contract signed successfully!";

In the above code, first obtain the contract ID and the signature file to be uploaded through $_GET. Then the identity and signature of the signer are verified. After the verification is passed, the signing information is saved to the database or other storage method, and a prompt message indicating that the signing is successful is returned.

3. Contract Query
   The contract query function is used by the signer or other relevant personnel to query the status and details of the contract. The following is a sample code:

$contractId = $_GET['contract_id'];

// 从数据库或其他存储方式中查询合同信息

// 输出合同信息

echo "Contract details:";

In the above code, the contract ID is obtained through $_GET. The contract details are then queried from the database or other storage method and output to the page.

Conclusion:
Through the introduction of this article, readers can understand how to use PHP to implement electronic signature and contract management functions. The electronic signature function mainly involves the process of generating signature images and verifying signatures, and the contract management function mainly includes steps such as contract creation, contract signing, and contract inquiry. We hope that readers can quickly implement electronic signature and contract management functions and improve work efficiency and security through the guidance of this article.

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