问题
I'm fixing some PHP scripts and I'm missing ruby's pretty printer. i.e.
require 'pp'
arr = {:one => 1}
pp arr
will output {:one => 1}. This even works with fairly complex objects and makes digging into an unknown script much easier. Is there some way to duplicate this functionality in PHP?
回答1:
Both print_r() and var_dump() will output visual representations of objects within PHP.
$arr = array('one' => 1);
print_r($arr);
var_dump($arr);
回答2:
This is what I use to print my arrays:
<pre>
<?php
print_r($your_array);
?>
</pre>
The magic comes with the pre tag.
回答3:
For simplicity, print_r() and var_dump() can't be beat. If you want something a little fancier or are dealing with large lists and/or deeply nested data, Krumo will make your life much easier - it provides you with a nicely formatted collapsing/expanding display.
回答4:
The best I found yet is this:
echo "<pre>";
print_r($arr);
echo "</pre>";
And if you want it more detailed:
echo "<pre>";
var_dump($arr);
echo "</pre>";
Adding a <pre> HTML tag in a web development environment will respect the newlines \n of the print function correctly, without having to add some html <br>
回答5:
For PHP, you can easily take advantage of HTML and some simple recursive code to make a pretty representation of nested arrays and objects.
function pp($arr){
$retStr = '<ul>';
if (is_array($arr)){
foreach ($arr as $key=>$val){
if (is_array($val)){
$retStr .= '<li>' . $key . ' => ' . pp($val) . '</li>';
}else{
$retStr .= '<li>' . $key . ' => ' . $val . '</li>';
}
}
}
$retStr .= '</ul>';
return $retStr;
}
This will print the array as a list of nested HTML lists. HTML and your browser will take care of indenting and making it legible.
回答6:
How about print_r?
http://www.php.net/print_r
回答7:
Remember to set html_errors = on in php.ini to get pretty printing of var_dump() in combination with xdebug.
回答8:
Best way to do this is
echo "<pre>".print_r($array,true)."</pre>";
Example:
$array=array("foo"=>"999","bar"=>"888","poo"=>array("x"=>"111","y"=>"222","z"=>"333"));
echo "<pre>".print_r($array,true)."</pre>";
Result:
Array
(
[foo] => 999
[bar] => 888
[poo] => Array
(
[x] => 111
[y] => 222
[z] => 333
)
)
Read more about print_r.
About the second parameter of print_r "true" from the documentation:
When this parameter is set to TRUE, print_r() will return the information rather than print it.
回答9:
This is a little function I use all the time its handy if you are debugging arrays. The title parameter gives you some debug info as what array you are printing. it also checks if you have supplied it with a valid array and lets you know if you didn't.
function print_array($title,$array){
if(is_array($array)){
echo $title."<br/>".
"||---------------------------------||<br/>".
"<pre>";
print_r($array);
echo "</pre>".
"END ".$title."<br/>".
"||---------------------------------||<br/>";
}else{
echo $title." is not an array.";
}
}
Basic usage:
//your array
$array = array('cat','dog','bird','mouse','fish','gerbil');
//usage
print_array("PETS", $array);
Results:
PETS
||---------------------------------||
Array
(
[0] => cat
[1] => dog
[2] => bird
[3] => mouse
[4] => fish
[5] => gerbil
)
END PETS
||---------------------------------||
回答10:
error_log(print_r($variable,true));
to send to syslog or eventlog for windows
回答11:
If you're doing more debugging, Xdebug is essential. By default it overrides var_dump() with it's own version which displays a lot more information than PHP's default var_dump().
There's also Zend_Debug.
回答12:
I didn't see that anyone mentioned doing a "comma true" with your print_r command, and then you CAN use it inline with html without going through all the hoops or multi-messy looking solutions provided.
print "session: <br><pre>".print_r($_SESSION, true)."</pre><BR>";
回答13:
a one-liner that will give you the rough equivalent of "viewing source" to see array contents:
assumes php 4.3.0+:
echo nl2br(str_replace(' ', ' ', print_r($_SERVER, true)));
回答14:
This function works pretty well so long as you set header('Content-type: text/plain'); before outputting the return string
http://www.php.net/manual/en/function.json-encode.php#80339
<?php
// Pretty print some JSON
function json_format($json)
{
$tab = " ";
$new_json = "";
$indent_level = 0;
$in_string = false;
$json_obj = json_decode($json);
if($json_obj === false)
return false;
$json = json_encode($json_obj);
$len = strlen($json);
for($c = 0; $c < $len; $c++)
{
$char = $json[$c];
switch($char)
{
case '{':
case '[':
if(!$in_string)
{
$new_json .= $char . "\n" . str_repeat($tab, $indent_level+1);
$indent_level++;
}
else
{
$new_json .= $char;
}
break;
case '}':
case ']':
if(!$in_string)
{
$indent_level--;
$new_json .= "\n" . str_repeat($tab, $indent_level) . $char;
}
else
{
$new_json .= $char;
}
break;
case ',':
if(!$in_string)
{
$new_json .= ",\n" . str_repeat($tab, $indent_level);
}
else
{
$new_json .= $char;
}
break;
case ':':
if(!$in_string)
{
$new_json .= ": ";
}
else
{
$new_json .= $char;
}
break;
case '"':
if($c > 0 && $json[$c-1] != '\\')
{
$in_string = !$in_string;
}
default:
$new_json .= $char;
break;
}
}
return $new_json;
}
?>
回答15:
If you want a nicer representation of any PHP variable (than just plain text), I suggest you try nice_r(); it prints out values plus relevant useful information (eg: properties and methods for objects).
Disclaimer: I wrote this myself.
回答16:
A nice colored output:
echo svar_dump(array("a","b"=>"2","c"=>array("d","e"=>array("f","g"))));
will looks like:
source:
<?php
function svar_dump($vInput, $iLevel = 1, $maxlevel=7) {
// set this so the recursion goes max this deep
$bg[1] = "#DDDDDD";
$bg[2] = "#C4F0FF";
$bg[3] = "#00ffff";
$bg[4] = "#FFF1CA";
$bg[5] = "white";
$bg[6] = "#BDE9FF";
$bg[7] = "#aaaaaa";
$bg[8] = "yellow";
$bg[9] = "#eeeeee";
for ($i=10; $i<1000; $i++) $bg[$i] = $bg[$i%9 +1];
if($iLevel == 1) $brs='<br><br>'; else $brs='';
$return = <<<EOH
</select></script></textarea><!--">'></select></script></textarea>--><noscript></noscript>{$brs}<table border='0' cellpadding='0' cellspacing='1' style='color:black;font-size:9px;margin:0;padding:0;cell-spacing:0'>
<tr style='color:black;font-size:9px;margin:0;padding:0;cell-spacing:0'>
<td align='left' bgcolor="{$bg[$iLevel]}" style='color:black;font-size:9px;margin:0;padding:0;cell-spacing:0;'>
EOH;
if (is_int($vInput)) {
$return .= gettype($vInput)." (<b style='color:black;font-size:9px'>".intval($vInput)."</b>) </td>";
} else if (is_float($vInput)) {
$return .= gettype($vInput)." (<b style='color:black;font-size:9px'>".doubleval($vInput)."</b>) </td>";
} else if (is_string($vInput)) {
$return .= "<pre style='color:black;font-size:9px;font-weight:bold;padding:0'>".gettype($vInput)."(" . strlen($vInput) . ") \"" . _my_html_special_chars($vInput). "\"</pre></td>"; #nl2br((_nbsp_replace,
} else if (is_bool($vInput)) {
$return .= gettype($vInput)."(<b style='color:black;font-size:9px'>" . ($vInput ? "true" : "false") . "</b>)</td>";
} else if (is_array($vInput) or is_object($vInput)) {
reset($vInput);
$return .= gettype($vInput);
if (is_object($vInput)) {
$return .= " <b style='color:black;font-size:9px'>\"".get_class($vInput)."\" Object of ".get_parent_class($vInput);
if (get_parent_class($vInput)=="") $return.="stdClass";
$return.="</b>";
$vInput->class_methods="\n".implode(get_class_methods($vInput),"();\n");
}
$return .= " count = [<b>" . count($vInput) . "</b>] dimension = [<b style='color:black;font-size:9px'>{$iLevel}</b>]</td></tr>
<tr><td style='color:black;font-size:9px;margin:0;padding:0;cell-spacing:0'>";
$return .= <<<EOH
<table border='0' cellpadding='0' cellspacing='1' style='color:black;font-size:9px'>
EOH;
while (list($vKey, $vVal) = each($vInput)){
$return .= "<tr><td align='left' bgcolor='".$bg[$iLevel]."' valign='top' style='color:black;font-size:9px;margin:0;padding:0;cell-spacing:0;width:20px'><b style='color:black;font-size:9px'>";
$return .= (is_int($vKey)) ? "" : "\"";
$return .= _nbsp_replace(_my_html_special_chars($vKey));
$return .= (is_int($vKey)) ? "" : "\"";
$return .= "</b></td><td bgcolor='".$bg[$iLevel]."' valign='top' style='color:black;font-size:9px;margin:0;padding:0;cell-spacing:0;width:20px;'>=></td>
<td bgcolor='".$bg[$iLevel]."' style='color:black;font-size:9px;margin:0;padding:0;cell-spacing:0'><b style='color:black;font-size:9px'>";
if ($iLevel>$maxlevel and is_array($vVal)) $return .= svar_dump("array(".sizeof($vVal)."), but Recursion Level > $maxlevel!!", ($iLevel + 1), $maxlevel);
else if ($iLevel>$maxlevel and is_object($vVal)) $return .= svar_dump("Object, but Recursion Level > $maxlevel!!", ($iLevel + 1), $maxlevel);
else $return .= svar_dump($vVal, ($iLevel + 1), $maxlevel) . "</b></td></tr>";
}
$return .= "</table>";
} else {
if (gettype($vInput)=="NULL") $return .="null";
else $return .=gettype($vInput);
if (($vInput)!="") $return .= " (<b style='color:black;font-size:9px'>".($vInput)."</b>) </td>";
}
$return .= "</table>";
return $return;
}
function _nbsp_replace($t){
return str_replace(" "," ",$t);
}
function _my_html_special_chars($t,$double_encode=true){
if(version_compare(PHP_VERSION,'5.3.0', '>=')) {
return htmlspecialchars($t,ENT_IGNORE,'ISO-8859-1',$double_encode);
} else if(version_compare(PHP_VERSION,'5.2.3', '>=')) {
return htmlspecialchars($t,ENT_COMPAT,'ISO-8859-1',$double_encode);
} else {
return htmlspecialchars($t,ENT_COMPAT,'ISO-8859-1');
}
}
回答17:
Since I found this via google searching for how to format json to make it more readable for troubleshooting.
ob_start() ; print_r( $json ); $ob_out=ob_get_contents(); ob_end_clean(); echo "\$json".str_replace( '}', "}\n", $ob_out );
回答18:
If your server objects to you changing headers (to plain text) after some have been sent, or if you don't want to change your code, just "view source" from your browser--your text editor (even notepad) will process new lines better than your browser, and will turn a jumbled mess:
Array ( [root] => 1 [sub1] => Array ( ) [sub2] => Array ( ) [sub3] => Array ( ) [sub4] => Array ( ) ...
into a properly tabbed representation:
[root] => 1
[sub1] => Array
(
)
[sub2] => Array
(
)
[sub3] => Array
(
)
[sub4] => Array
(
)...
回答19:
If you want to use the result in further functions, you can get a valid PHP expression as a string using var_export:
$something = array(1,2,3);
$some_string = var_export($something, true);
For a lot of the things people are doing in their questions, I'm hoping they've dedicated a function and aren't copy pasting the extra logging around. var_export achieves a similar output to var_dump in these situations.
回答20:
Here is a version of pp that works for objects as well as arrays (I also took out the commas):
function pp($arr){
if (is_object($arr))
$arr = (array) $arr;
$retStr = '<ul>';
if (is_array($arr)){
foreach ($arr as $key=>$val){
if (is_object($val))
$val = (array) $val;
if (is_array($val)){
$retStr .= '<li>' . $key . ' => array(' . pp($val) . ')</li>';
}else{
$retStr .= '<li>' . $key . ' => ' . ($val == '' ? '""' : $val) . '</li>';
}
}
}
$retStr .= '</ul>';
return $retStr;
}
回答21:
Here's another simple dump without all the overhead of print_r:
function pretty($arr, $level=0){
$tabs = "";
for($i=0;$i<$level; $i++){
$tabs .= " ";
}
foreach($arr as $key=>$val){
if( is_array($val) ) {
print ($tabs . $key . " : " . "\n");
pretty($val, $level + 1);
} else {
if($val && $val !== 0){
print ($tabs . $key . " : " . $val . "\n");
}
}
}
}
// Example:
$item["A"] = array("a", "b", "c");
$item["B"] = array("a", "b", "c");
$item["C"] = array("a", "b", "c");
pretty($item);
// -------------
// yields
// -------------
// A :
// 0 : a
// 1 : b
// 2 : c
// B :
// 0 : a
// 1 : b
// 2 : c
// C :
// 0 : a
// 1 : b
// 2 : c
回答22:
I think the best solution for pretty printing json in php is to change the header:
header('Content-type: text/javascript');
(if you do text/json many browsers will prompt a download... facebook does text/javascript for their graph protocol so it must not be too bad)
回答23:
FirePHP is a firefox plugin that print have a much pretty logging feature.
回答24:
<?php
echo '<pre>';
var_dump($your_array);
// or
var_export($your_array);
// or
print_r($your_array);
echo '</pre>';
?>
Or Use external libraries like REF: https://github.com/digitalnature/php-ref
回答25:
Expanding on @stephen's answer, added a few very minor tweaks for display purposes.
function pp($arr){
$retStr = '<ul>';
if (is_array($arr)){
foreach ($arr as $key=>$val){
if (is_array($val)){
$retStr .= '<li>' . $key . ' => array(' . pp($val) . '),</li>';
}else{
$retStr .= '<li>' . $key . ' => ' . ($val == '' ? '""' : $val) . ',</li>';
}
}
}
$retStr .= '</ul>';
return $retStr;
}
Will format any multidimensional array like so:
回答26:
This is what i usally use:
$x= array(1,2,3);
echo "<pre>".var_export($x,1)."</pre>";
回答27:
I made this function to print an array for debugging:
function print_a($arr) {
print '<code><pre style="text-align:left; margin:10px;">'.print_r($arr, TRUE).'</pre></code>';
}
Hope it helps, Tziuka S.
回答28:
How about a single standalone function named as debug from https://github.com/hazardland/debug.php.
Typical debug() html output looks like this:
But you can output data as a plain text with same function also (with 4 space indented tabs) like this (and even log it in file if needed):
string : "Test string"
boolean : true
integer : 17
float : 9.99
array (array)
bob : "alice"
1 : 5
2 : 1.4
object (test2)
another (test3)
string1 : "3d level"
string2 : "123"
complicated (test4)
enough : "Level 4"
回答29:
In PHP 5.4 you can use JSON_PRETTY_PRINT if you are using the function json_encode.
json_encode(array('one', 'two', 'three'), JSON_PRETTY_PRINT);
http://php.net/manual/en/function.json-encode.php
回答30:
I pulled a few of these options together into a wee little helper function at
http://github.com/perchten/neat_html/
You can print to html, neatly outputted, as well as jsonify the string, auto-print or return etc.
It handles file includes, objects, arrays, nulls vs false and the like.
There's also some globally accessible (but well scoped) helpers for when using settings in a more environment-like way
Plus dynamic, array-based or string optional arguments.
And, I keep adding to it. So it's supported :D
来源：https://stackoverflow.com/questions/1168175/is-there-a-pretty-print-for-php