讓 Javascript 也有 PHP 的 print_r() 函式

有了php才有的 print_r() 來瞬間印出整個陣列，這樣子將來開發 JS 時 debug 方便多了。

function print_r (array, return_val) {
    // Prints out or returns information about the specified variable  
    // 
    // version: 1008.1718
    // discuss at: http://phpjs.org/functions/print_r    // +   original by: Michael White (http://getsprink.com)
    // +   improved by: Ben Bryan
    // +      input by: Brett Zamir (http://brett-zamir.me)
    // +      improved by: Brett Zamir (http://brett-zamir.me)
    // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)    // -    depends on: echo
    // *     example 1: print_r(1, true);
    // *     returns 1: 1
    
    var output = "", pad_char = " ", pad_val = 4, d = this.window.document;    var getFuncName = function (fn) {
        var name = (/\W*function\s+([\w\$]+)\s*\(/).exec(fn);
        if (!name) {
            return '(Anonymous)';
        }        return name[1];
    };
 
    var repeat_char = function (len, pad_char) {
        var str = "";        for (var i=0; i < len; i++) {
            str += pad_char;
        }
        return str;
    }; 
    var formatArray = function (obj, cur_depth, pad_val, pad_char) {
        if (cur_depth > 0) {
            cur_depth++;
        } 
        var base_pad = repeat_char(pad_val*cur_depth, pad_char);
        var thick_pad = repeat_char(pad_val*(cur_depth+1), pad_char);
        var str = "";
         if (typeof obj === 'object' && obj !== null && obj.constructor && getFuncName(obj.constructor) !== 'PHPJS_Resource') {
            str += "Array\n" + base_pad + "(\n";
            for (var key in obj) {
                if (obj[key] instanceof Array) {
                    str += thick_pad + "["+key+"] => "+formatArray(obj[key], cur_depth+1, pad_val, pad_char);                } else {
                    str += thick_pad + "["+key+"] => " + obj[key] + "\n";
                }
            }
            str += base_pad + ")\n";        } else if (obj === null || obj === undefined) {
            str = '';
        } else { // for our "resource" class
            str = obj.toString();
        } 
        return str;
    };
 
    output = formatArray(array, 0, pad_val, pad_char); 
    if (return_val !== true) {
        if (d.body) {
            this.echo(output);
        }        else {
            try {
                d = XULDocument; // We're in XUL, so appending as plain text won't work; trigger an error out of XUL
                this.echo('<pre xmlns="http://www.w3.org/1999/xhtml" style="white-space:pre;">'+output+'</pre>');
            }            catch (e) {
                this.echo(output); // Outputting as plain text may work in some plain XML
            }
        }
        return true;    } else {
        return output;
    }
}

http://kevin.vanzonneveld.net/techblog/category/php2js/

這個網址有一系列 php to js 的函式模擬功能，需要時可以參考看看

很多好用的php函式都可以在JS上模擬出來