如何修改给定PHP循环代码，统计成功与错误的总次数？

Got it, let's tweak your code to properly track and output the total success and error counts you need. First, let's fix a couple of small issues in your original code, then add the counting functionality step by step:

1. Fix the loop increment bug: Your current code has $i++ both in the for loop declaration and at the end of the loop body. This makes each iteration increment $i twice, so your loop will only run 51 times instead of 101. We'll remove the extra $i++ inside the loop.
2. Fix the preg_match pattern: PHP's preg_match requires delimiters (like /) around the regex pattern to work correctly—your original pattern is missing these.
3. Add count trackers: We'll initialize two variables to keep tabs on how many times we get a success vs. error.
4. Output final stats: After the loop finishes, we'll print the totals in the exact format you requested.

Here's the revised code:

<?php
error_reporting(E_ALL ^ (E_NOTICE | E_WARNING));

// Initialize counters to track success and error counts
$successCount = 0;
$errorCount = 0;

for ($i = 0; $i <= 100; $i++) {
    $url = "site.com";
    $h = [
        "Accept-Language: en-US,en;q=0.8",
    ];
    
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_HTTPHEADER, $h);
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    $x = curl_exec($ch);
    curl_close($ch);
    
    // Check if the response contains the HTML doctype
    if (preg_match('/<!DOCTYPE html>/', $x)) {
        echo "Success\n";
        $successCount++; // Increment success counter
    } else {
        echo "Error\n";
        $errorCount++; // Increment error counter
    }
}

// Print the final statistics in your desired format
echo "Success {$successCount} times and error {$errorCount} times";
?>

Quick Notes on Key Changes: #

• Counter Variables: $successCount and $errorCount start at 0, and we increment them each time we hit a success or error case.
• Fixed Loop: Removing the extra $i++ ensures the loop runs exactly 101 times (from 0 to 100 inclusive, which matches your original intent).
• Robust Regex: If the target site's doctype has extra whitespace or uses uppercase letters, you can adjust the regex to /<!DOCTYPE\s+html>/i—the i flag makes it case-insensitive, and \s+ accounts for any spaces between DOCTYPE and html.

If you don't need to see each individual success/error message during the loop, just delete the echo "Success\n"; and echo "Error\n"; lines inside the loop to clean up the output.

内容的提问来源于stack exchange，提问作者Eyus Wap