Pretty-Printing JSON with PHP

2018-12-31 06:13发布

站内问答 / PHP
1191 21 4

I'm building a PHP script that feeds JSON data to another script. My script builds data into a large associative array, and then outputs the data using json_encode. Here is an example script:

$data = array('a' => 'apple', 'b' => 'banana', 'c' => 'catnip');
header('Content-type: text/javascript');
echo json_encode($data);

The above code yields the following output:

{"a":"apple","b":"banana","c":"catnip"}

This is great if you have a small amount of data, but I'd prefer something along these lines: 

{
    "a": "apple",
    "b": "banana",
    "c": "catnip"
}

Is there a way to do this in PHP without an ugly hack? It seems like someone at Facebook figured it out.

21条回答
怪性笑人.
2楼-- · 2018-12-31 07:00

print_r pretty print for PHP

Example PHP

function print_nice($elem,$max_level=10,$print_nice_stack=array()){
    if(is_array($elem) || is_object($elem)){
        if(in_array($elem,$print_nice_stack,true)){
            echo "<font color=red>RECURSION</font>";
            return;
        }
        $print_nice_stack[]=&$elem;
        if($max_level<1){
            echo "<font color=red>nivel maximo alcanzado</font>";
            return;
        }
        $max_level--;
        echo "<table border=1 cellspacing=0 cellpadding=3 width=100%>";
        if(is_array($elem)){
            echo '<tr><td colspan=2 style="background-color:#333333;"><strong><font color=white>ARRAY</font></strong></td></tr>';
        }else{
            echo '<tr><td colspan=2 style="background-color:#333333;"><strong>';
            echo '<font color=white>OBJECT Type: '.get_class($elem).'</font></strong></td></tr>';
        }
        $color=0;
        foreach($elem as $k => $v){
            if($max_level%2){
                $rgb=($color++%2)?"#888888":"#BBBBBB";
            }else{
                $rgb=($color++%2)?"#8888BB":"#BBBBFF";
            }
            echo '<tr><td valign="top" style="width:40px;background-color:'.$rgb.';">';
            echo '<strong>'.$k."</strong></td><td>";
            print_nice($v,$max_level,$print_nice_stack);
            echo "</td></tr>";
        }
        echo "</table>";
        return;
    }
    if($elem === null){
        echo "<font color=green>NULL</font>";
    }elseif($elem === 0){
        echo "0";
    }elseif($elem === true){
        echo "<font color=green>TRUE</font>";
    }elseif($elem === false){
        echo "<font color=green>FALSE</font>";
    }elseif($elem === ""){
        echo "<font color=green>EMPTY STRING</font>";
    }else{
        echo str_replace("\n","<strong><font color=red>*</font></strong><br>\n",$elem);
    }
}
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余生无你
3楼-- · 2018-12-31 07:02

Gluing several answers together fit my need for existing json:

echo "<pre>"; 
echo json_encode(json_decode($json_response), JSON_PRETTY_PRINT); 
echo "</pre>";

{
    "data": {
        "token_type": "bearer",
        "expires_in": 3628799,
        "scopes": "full_access",
        "created_at": 1540504324
    },
    "errors": [],
    "pagination": {},
    "token_type": "bearer",
    "expires_in": 3628799,
    "scopes": "full_access",
    "created_at": 1540504324
}
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听够珍惜
4楼-- · 2018-12-31 07:02

The following is what worked for me:

Contents of test.php:

<html>
<body>
Testing JSON array output
  <pre>
  <?php
  $data = array('a'=>'apple', 'b'=>'banana', 'c'=>'catnip');
  // encode in json format 
  $data = json_encode($data);

  // json as single line
  echo "</br>Json as single line </br>";
  echo $data;
  // json as an array, formatted nicely
  echo "</br>Json as multiline array </br>";
  print_r(json_decode($data, true));
  ?>
  </pre>
</body>
</html>

output:

Testing JSON array output


Json as single line 
{"a":"apple","b":"banana","c":"catnip"}
Json as multiline array 
Array
(
    [a] => apple
    [b] => banana
    [c] => catnip
)

Also note the use of "pre" tag in html.

Hope that helps someone

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