<?php
// Simulated form data
$formData = [
    "username" => "john_doe",
    "email" => "john@example.com",
    "password" => "pass123",
    "age" => "25",
    "terms" => "yes"
];

// Required fields
$requiredFields = ["username", "email", "password", "terms"];

// Validation rules
$validationRules = [
    "username" => "/^[a-zA-Z0-9_]{3,20}$/",
    "email" => "/^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/",
    "password" => "/^.{6,}$/",
    "age" => "/^[0-9]+$/"
];

// Validate the form
$errors = [];
$isValid = true;

foreach ($formData as $field => $value) {
    // Skip fields that don't have validation rules
    if (!isset($validationRules[$field])) {
        echo "Field '$field' doesn't have validation rules, skipping...<br>";
        continue;
    }
    
    // Check if required field is empty
    if (in_array($field, $requiredFields) && empty($value)) {
        $errors[] = "Field '$field' is required but empty";
        $isValid = false;
        continue; // No need to perform pattern validation if empty
    }
    
    // Validate against pattern
    if (!preg_match($validationRules[$field], $value)) {
        $errors[] = "Field '$field' has invalid format: '$value'";
        $isValid = false;
    } else {
        echo "Field '$field' is valid: '$value'<br>";
    }
}

// Check final validation result
if ($isValid) {
    echo "<hr>Form is valid! Processing data...";
} else {
    echo "<hr>Form has errors:<br>";
    foreach ($errors as $error) {
        echo "- $error<br>";
    }
}
?>

<?php
// Simulate processing a batch of records
$records = [
    ["id" => 1, "name" => "John Smith", "email" => "john@example.com"],
    ["id" => 2, "name" => "Jane Doe", "email" => "jane@example.com"],
    ["id" => 3, "name" => "", "email" => "missing.name@example.com"],  // Missing name
    ["id" => 4, "name" => "Bob Johnson", "email" => "bob@example.com"],
    ["id" => 5, "name" => "Alice Brown", "email" => "invalid-email"]  // Invalid email
];

$batchId = "BATCH-" . date("Ymd-His");
$successCount = 0;
$errorCount = 0;
$continueOnError = true; // Toggle to control error handling behavior

echo "Starting to process batch: $batchId<br>";
echo "<hr>";

foreach ($records as $index => $record) {
    echo "Processing record #" . ($index + 1) . " (ID: " . $record["id"] . ")<br>";
    
    // Validate record
    $errors = [];
    
    if (empty($record["name"])) {
        $errors[] = "Name is required";
    }
    
    if (empty($record["email"]) || !filter_var($record["email"], FILTER_VALIDATE_EMAIL)) {
        $errors[] = "Valid email is required";
    }
    
    // Check for validation errors
    if (!empty($errors)) {
        $errorCount++;
        echo "Validation errors found:<br>";
        foreach ($errors as $error) {
            echo "- $error<br>";
        }
        
        if ($continueOnError) {
            echo "Skipping this record and continuing with the next one...<br>";
            echo "<hr>";
            continue;
        } else {
            echo "Aborting batch processing due to errors<br>";
            break;
        }
    }
    
    // Process the valid record (in a real app, this might be a database insert)
    echo "Record processed successfully: " . $record["name"] . " <" . $record["email"] . "><br>";
    $successCount++;
    echo "<hr>";
}

// Final report
echo "Batch processing complete<br>";
echo "Successful records: $successCount<br>";
echo "Failed records: $errorCount<br>";
echo "Total records: " . count($records) . "<br>";

if ($continueOnError) {
    echo "Errors were skipped during processing";
} else {
    echo "Processing stopped at the first error";
}
?>