我正在构建一个PHP脚本,将JSON数据提供给另一个脚本。我的脚本将数据构建到一个大型关联数组中,然后使用json_encode输出数据。下面是一个脚本示例:
$data = array('a' => 'apple', 'b' => 'banana', 'c' => 'catnip');
header('Content-type: text/javascript');
echo json_encode($data);
上面的代码产生如下输出:
{"a":"apple","b":"banana","c":"catnip"}
如果你有少量的数据,这是很好的,但我更喜欢这样的东西:
{
"a": "apple",
"b": "banana",
"c": "catnip"
}
有没有办法在PHP中做到这一点,而不需要丑陋的黑客?似乎Facebook的某个人发现了这一点。
这个函数将接受JSON字符串并缩进,使其非常可读。它也是收敛的,
prettyPrint( $json ) === prettyPrint( prettyPrint( $json ) )
输入
{"key1":[1,2,3],"key2":"value"}
输出
{
"key1": [
1,
2,
3
],
"key2": "value"
}
Code
function prettyPrint( $json )
{
$result = '';
$level = 0;
$in_quotes = false;
$in_escape = false;
$ends_line_level = NULL;
$json_length = strlen( $json );
for( $i = 0; $i < $json_length; $i++ ) {
$char = $json[$i];
$new_line_level = NULL;
$post = "";
if( $ends_line_level !== NULL ) {
$new_line_level = $ends_line_level;
$ends_line_level = NULL;
}
if ( $in_escape ) {
$in_escape = false;
} else if( $char === '"' ) {
$in_quotes = !$in_quotes;
} else if( ! $in_quotes ) {
switch( $char ) {
case '}': case ']':
$level--;
$ends_line_level = NULL;
$new_line_level = $level;
break;
case '{': case '[':
$level++;
case ',':
$ends_line_level = $level;
break;
case ':':
$post = " ";
break;
case " ": case "\t": case "\n": case "\r":
$char = "";
$ends_line_level = $new_line_level;
$new_line_level = NULL;
break;
}
} else if ( $char === '\\' ) {
$in_escape = true;
}
if( $new_line_level !== NULL ) {
$result .= "\n".str_repeat( "\t", $new_line_level );
}
$result .= $char.$post;
}
return $result;
}
1 - json_encode($rows,JSON_PRETTY_PRINT);返回带有换行符的美化数据。这对于命令行输入很有帮助,但正如您所发现的那样,在浏览器中看起来不那么漂亮。浏览器将接受换行符作为源(因此,查看页面源确实会显示漂亮的JSON),但它们并不用于在浏览器中格式化输出。浏览器需要HTML。
2 -使用这个功能github
<?php
/**
* Formats a JSON string for pretty printing
*
* @param string $json The JSON to make pretty
* @param bool $html Insert nonbreaking spaces and <br />s for tabs and linebreaks
* @return string The prettified output
* @author Jay Roberts
*/
function _format_json($json, $html = false) {
$tabcount = 0;
$result = '';
$inquote = false;
$ignorenext = false;
if ($html) {
$tab = " ";
$newline = "<br/>";
} else {
$tab = "\t";
$newline = "\n";
}
for($i = 0; $i < strlen($json); $i++) {
$char = $json[$i];
if ($ignorenext) {
$result .= $char;
$ignorenext = false;
} else {
switch($char) {
case '[':
case '{':
$tabcount++;
$result .= $char . $newline . str_repeat($tab, $tabcount);
break;
case ']':
case '}':
$tabcount--;
$result = trim($result) . $newline . str_repeat($tab, $tabcount) . $char;
break;
case ',':
$result .= $char . $newline . str_repeat($tab, $tabcount);
break;
case '"':
$inquote = !$inquote;
$result .= $char;
break;
case '\\':
if ($inquote) $ignorenext = true;
$result .= $char;
break;
default:
$result .= $char;
}
}
}
return $result;
}