| 1 |
<?php |
| 2 |
/** |
| 3 |
* Phone Validation for Contact Forms |
| 4 |
* |
| 5 |
* Follows ITU-T E.164 standard (7-15 digits) with lenient formatting. |
| 6 |
* Allows flexible formatting: spaces, dashes, dots, slashes, parentheses, plus sign. |
| 7 |
* Requires minimum 7 digits for actual phone numbers (most countries have 7+ digit numbers). |
| 8 |
* Data is stored as plain text - this is purely a frontend/validation enhancement. |
| 9 |
* |
| 10 |
* @package Contact Forms |
| 11 |
* @subpackage Validation |
| 12 |
* @since 2.0.0-beta.34 |
| 13 |
*/ |
| 14 |
|
| 15 |
class AccuaForm_Validation_Phone extends Validation { |
| 16 |
protected $message = "Error: %element% must contain a valid phone number."; |
| 17 |
|
| 18 |
/** |
| 19 |
* Constructor |
| 20 |
* |
| 21 |
* @param string $message Custom error message (optional). Use %element% as placeholder for field label. |
| 22 |
*/ |
| 23 |
public function __construct($message = "") { |
| 24 |
if (!empty($message)) { |
| 25 |
$this->message = $message; |
| 26 |
} else { |
| 27 |
// translators: %element% is the field label. |
| 28 |
$this->message = __( "Please enter a valid phone number in %element%", 'contact-forms' ); |
| 29 |
} |
| 30 |
} |
| 31 |
|
| 32 |
/** |
| 33 |
* Validate phone number following ITU-T E.164 standard |
| 34 |
* |
| 35 |
* E.164 specifies maximum 15 digits (not counting the + sign). |
| 36 |
* We require a minimum of 7 digits for actual phone numbers. |
| 37 |
* We allow flexible formatting for user convenience: |
| 38 |
* - Minimum 7 digits (most countries have 7+ digit numbers) |
| 39 |
* - Maximum 15 digits (E.164 compliant) |
| 40 |
* - Allows: digits, spaces, dashes, dots, slashes, parentheses, plus sign |
| 41 |
* - Plus sign only allowed at the beginning |
| 42 |
* - Prefix-only values (≤4 digits with +) are treated as empty for optional fields |
| 43 |
* |
| 44 |
* @param string $value The phone number to validate |
| 45 |
* @return bool True if valid or empty (empty handled by Required validation), false otherwise |
| 46 |
*/ |
| 47 |
public function isValid($value) { |
| 48 |
// Skip validation for empty/null values (handled by Required validation if needed) |
| 49 |
if ($this->isNotApplicable($value)) { |
| 50 |
return true; |
| 51 |
} |
| 52 |
|
| 53 |
// Trim whitespace |
| 54 |
$value = trim($value); |
| 55 |
|
| 56 |
// Empty after trim is valid (Required validation handles mandatory fields) |
| 57 |
if ($value === '') { |
| 58 |
return true; |
| 59 |
} |
| 60 |
|
| 61 |
// FIRST: Check for invalid characters (only digits, spaces, dashes, dots, slashes, parentheses, plus) |
| 62 |
if (!preg_match('/^[\d\s\-\.\/\(\)\+]+$/', $value)) { |
| 63 |
return false; |
| 64 |
} |
| 65 |
|
| 66 |
// Plus sign only allowed at the start |
| 67 |
if (strpos($value, '+') !== false && strpos($value, '+') !== 0) { |
| 68 |
return false; |
| 69 |
} |
| 70 |
|
| 71 |
// Multiple plus signs not allowed |
| 72 |
if (substr_count($value, '+') > 1) { |
| 73 |
return false; |
| 74 |
} |
| 75 |
|
| 76 |
// Count digits only |
| 77 |
$digitCount = strlen(preg_replace('/\D/', '', $value)); |
| 78 |
|
| 79 |
// Treat prefix-only values (1-4 digits starting with +) as empty for optional fields |
| 80 |
// This allows optional phone fields with placeholder prefixes like "+39" to pass validation |
| 81 |
if (strpos($value, '+') === 0 && $digitCount <= 4) { |
| 82 |
return true; |
| 83 |
} |
| 84 |
|
| 85 |
// Require minimum 5 digits for actual phone numbers |
| 86 |
// NOTE: Client-side uses libphonenumber which may accept 5-6 digit numbers for some countries |
| 87 |
// Server must be equal or more lenient to avoid rejecting client-accepted values |
| 88 |
if ($digitCount < 5) { |
| 89 |
return false; |
| 90 |
} |
| 91 |
|
| 92 |
// E.164 standard: maximum 15 digits |
| 93 |
if ($digitCount > 15) { |
| 94 |
return false; |
| 95 |
} |
| 96 |
|
| 97 |
return true; |
| 98 |
} |
| 99 |
} |
| 100 |
|
