conversion of Array to JSON safely

safe_json_conversion.php

<?php

function utf8ize($d) {
    if (is_array($d)) {
        foreach ($d as $k => $v) {
            $d[$k] = utf8ize($v);
        }
    } else if (is_string ($d)) {
        // return utf8_encode($d);
        return iconv(mb_detect_encoding($d), "UTF-8", $d);
    }
    return $d;
}

function safe_json_encode($value){
	if (version_compare(PHP_VERSION, '5.4.0') >= 0) {
	    // $encoded = json_encode($value, JSON_PRETTY_PRINT);
	    // applying multiple filters as provided in following link [now tested output yet]
	    // http://php.net/manual/en/function.json-encode.php
	    $encoded = json_encode($value, JSON_PRETTY_PRINT | JSON_PARTIAL_OUTPUT_ON_ERROR | JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_QUOT | JSON_HEX_AMP | JSON_UNESCAPED_UNICODE);
	} else {
	    $encoded = json_encode($value);
	}
	
	/*
	List of possible exceptions :
	0 JSON_ERROR_NONE
	1 JSON_ERROR_DEPTH
	2 JSON_ERROR_STATE_MISMATCH
	3 JSON_ERROR_CTRL_CHAR
	4 JSON_ERROR_SYNTAX
	5 JSON_ERROR_UTF8
	6 JSON_ERROR_RECURSION
	7 JSON_ERROR_INF_OR_NAN
	8 JSON_ERROR_UNSUPPORTED_TYPE
	*/
	
	switch (json_last_error()) {
	    case JSON_ERROR_NONE:
	        return $encoded;
	    case JSON_ERROR_DEPTH:
	    	throw new Exception( 'Maximum stack depth exceeded: {code: ' . json_last_error() . ', message: ' . json_last_error_msg() .'}'  );
	    case JSON_ERROR_STATE_MISMATCH:
	        throw new Exception( 'Underflow or the modes mismatch: {code: ' . json_last_error() . ', message: ' . json_last_error_msg() .'}'  );
	    case JSON_ERROR_CTRL_CHAR:
	        throw new Exception( 'Unexpected control character found: {code: ' . json_last_error() . ', message: ' . json_last_error_msg() .'}'  );
	    case JSON_ERROR_SYNTAX:
		throw new Exception( 'Syntax error, malformed JSON: {code: ' . json_last_error() . ', message: ' . json_last_error_msg() .'}' );
	    case JSON_ERROR_UTF8:
		// throw new Exception( 'Malformed UTF-8 characters, possibly incorrectly encoded' );
	        $clean = utf8ize($value);
	        return safe_json_encode($clean);
	    case JSON_ERROR_RECURSION:
		throw new Exception( 'JSON error ristriction: {code: ' . json_last_error() . ', message: ' . json_last_error_msg() .'}' );
	    case JSON_ERROR_INF_OR_NAN:
		throw new Exception( 'Infinite value or NaN (not a number) found in Json: {code: ' . json_last_error() . ', message: ' . json_last_error_msg() .'}' );
		/* # possible solution but taking too much time in response so avoiding this
		json_encode(unserialize(str_replace(array('NAN;','INF;'),'0;',serialize($value)))); */
	    case JSON_ERROR_UNSUPPORTED_TYPE:
		throw new Exception( 'JSON error unsupported type: {code: ' . json_last_error() . ', message: ' . json_last_error_msg() .'}' );
	    default:
	        throw new Exception( 'Unknown error: {code: ' . json_last_error() . ', message: ' . json_last_error_msg() .'}' );
	}
}

$arr = [];

try {
	$json = safe_json_encode($arr);
} catch( Exception $e ) {
	print_r($e); die;
}

header('Content-Type: application/json');
echo $json;
exit();