How to 'console log' PHP code in Chrome or Firefox?

Question

I've been looking up how I can debug PHP code in Chrome or Firefox but I can;t really find a solution. This is my PHP:

<?php
    if(isset($_POST["data"]))
    {
        $var = $_POST["data"];
        print "your message: " . $_POST["data"];
        if(!empty($_POST['ip.data'])){
        $data = $_POST['ip.data'];
        $fname = mktime() . ".txt";//generates random name

        $file = fopen("upload/" .$fname, 'w');//creates new file
        fwrite($file, $data);
        fclose($file);
        }
    }
?>

I want to be able to see the output of print "your message: " . $_POST["data"]; or any errors in Chrome or Firefox. I've tried Firefox Quantum that should be able to debug php? Anyways, how can I console log this?

Answer 1

第一步是认识到通常是服务器端语言的PHP与浏览器的控制台完全不同，后者基本上是 Javascript。因此，要从服务器向浏览器的控制台显示消息，您需要找到某种方式将这些消息（例如，错误）传达给浏览器。

那时，您可能会考虑在 PHP 中嵌入脚本标签这样简单的事情：

function debugToBrowserConsole ( $msg ) {
    $msg = str_replace('"', "''", $msg);  # weak attempt to make sure there's not JS breakage
    echo "<script>console.debug( \"PHP DEBUG: $msg\" );</script>";
}
function errorToBrowserConsole ( $msg ) {
    $msg = str_replace('"', "''", $msg);  # weak attempt to make sure there's not JS breakage
    echo "<script>console.error( \"PHP ERROR: $msg\" );</script>";
}
function warnToBrowserConsole ( $msg ) {
    $msg = str_replace('"', "''", $msg);  # weak attempt to make sure there's not JS breakage
    echo "<script>console.warn( \"PHP WARNING: $msg\" );</script>";
}
function logToBrowserConsole ( $msg ) {
    $msg = str_replace('"', "''", $msg);  # weak attempt to make sure there's not JS breakage
    echo "<script>console.log( \"PHP LOG: $msg\" );</script>";
}

# Convenience functions
function d2c ( $msg ) { debugToBrowserConsole( $msg ); }
function e2c ( $msg ) { errorToBrowserConsole( $msg ); }
function w2c ( $msg ) { warnToBrowserConsole( $msg ); }
function l2c ( $msg ) { logToBrowserConsole( $msg ); }

if ( 'POST' === $_SERVER['REQUEST_METHOD'] ) {
    if ( isset( $_POST['data'] ) ) {
        d2c( "Your message: {$_POST['data']}" 
        e2c( "This is an error from PHP" );
        w2c( "This is a warning from PHP" );
        l2c( "This is a log message from PHP" );
        ...
    }
}

但这将是一种从根本上软弱而脆弱的方法。我建议直接在服务器上拖尾您的日志文件。如果您追求某种颜色，请考虑使用clog, lwatch, 或grc：

$ grc tail -f /var/log/syslog

Answer 2

我希望能有所帮助：

ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);