11c01-1.php

介绍PHP5的给类型函数应用

<?php
// A function that will accept US phone numbers, in most every format
// and standardize them to xxx-xxx-xxxx format.
function standardize_phone($phone) {
    // First, remove all non-digits from the string
    $p = preg_replace('/[^0-9]/', '', $phone);
    
    // Now, break it into it's appropriate parts and insert dashes.
    return substr($p, 0, 3) . '-' . substr($p, 3, 3) . '-' . substr($p, 6);
}

// A function to check for phone number validity
// It requires a standardized number
function validate_phone($phone) {
    // First split the number into 3 parts:
    $parts = explode('-', $phone);
    
    // If the middle is '555'
    if ($parts[1] == '555') {
        // Invalid if the final part is between 0100 and 0199
        if (($parts[2] >= 100) && ($parts[2] < 200)) {
            return false;
        }
    }
    
    // Invalid if the first digit of the area code is 0 or 1
    if ($parts[0] < 200) {
        return false;
    }
    
    // Invalid if the second digit of the area code, is 9
    if ($parts[0]{1} == '9') {
        return false;
    }
    
    // Check that the last number has 4 characters:
    if (strlen($parts[2]) != 4) {
        return false;
    }
    
    // Otherwise, we made it, it's valid.
    return true;
}

// Standardize & validate some phone numbers:
$phones = array('[phone]', '354-555-0103', '294.423.8437',
                '301 867-5309', '424-726 739', '829-56628426', 'Hello');
foreach ($phones as $num) {
    $st = standardize_phone($num);
    $valid = validate_phone($st);
    $output = $valid ? 'Valid' : 'Invalid';
    echo "<p>{$st} - {$output}</p>\n";
}
?>