JavascriptでPHP jsonエンコードエラーが発生する

Question

HTMLページで次のエラーが発生しています。

Uncaught SyntaxError: page URL Here Unexpected token ;

これは（変数が他の場所で定義されていて、存在しています。

<script> 
    statesDropDown = <?php echo json_encode($this->states);?>; 
    programIdsDropDown = <?php echo json_encode($this->programIdsData);?>; 
</script> 

これは私がエンコードを削除したページ上で上記の結果

<script> 
    statesDropDown = [{"id":"1","code":"AL","name":"Alabama"},{"id":"2","code":"AK","name":"Alaska"},{"id":"3","code":"AZ","name":"Arizona"},{"id":"4","code":"AR","name":"Arkansas"},{"id":"5","code":"CA","name":"California"},{"id":"6","code":"CO","name":"Colorado"},{"id":"7","code":"CT","name":"Connecticut"},{"id":"8","code":"DE","name":"Delaware"},{"id":"9","code":"FL","name":"Florida"},{"id":"10","code":"GA","name":"Georgia"},{"id":"11","code":"HI","name":"Hawaii"},{"id":"12","code":"ID","name":"Idaho"},{"id":"13","code":"IL","name":"Illinois"},{"id":"14","code":"IN","name":"Indiana"},{"id":"15","code":"IA","name":"Iowa"},{"id":"16","code":"KS","name":"Kansas"},{"id":"17","code":"KY","name":"Kentucky"},{"id":"18","code":"LA","name":"Louisiana"},{"id":"19","code":"ME","name":"Maine"},{"id":"20","code":"MD","name":"Maryland"},{"id":"21","code":"MA","name":"Massachusetts"},{"id":"22","code":"MI","name":"Michigan"},{"id":"23","code":"MN","name":"Minnesota"},{"id":"24","code":"MS","name":"Mississippi"},{"id":"25","code":"MO","name":"Missouri"},{"id":"26","code":"MT","name":"Montana"},{"id":"27","code":"NE","name":"Nebraska"},{"id":"28","code":"NV","name":"Nevada"},{"id":"29","code":"NH","name":"New Hampshire"},{"id":"30","code":"NJ","name":"New Jersey"},{"id":"31","code":"NM","name":"New Mexico"},{"id":"32","code":"NY","name":"New York"},{"id":"33","code":"NC","name":"North Carolina"},{"id":"34","code":"ND","name":"North Dakota"},{"id":"35","code":"OH","name":"Ohio"},{"id":"36","code":"OK","name":"Oklahoma"},{"id":"37","code":"OR","name":"Oregon"},{"id":"38","code":"PA","name":"Pennsylvania"},{"id":"39","code":"RI","name":"Rhode Island"},{"id":"40","code":"SC","name":"South Carolina"},{"id":"41","code":"SD","name":"South Dakota"},{"id":"42","code":"TN","name":"Tennessee"},{"id":"43","code":"TX","name":"Texas"},{"id":"44","code":"UT","name":"Utah"},{"id":"45","code":"VT","name":"Vermont"},{"id":"46","code":"VA","name":"Virginia"},{"id":"47","code":"WA","name":"Washington"},{"id":"48","code":"WV","name":"West Virginia"},{"id":"49","code":"WI","name":"Wisconsin"},{"id":"50","code":"WY","name":"Wyoming"}]; 
    programIdsDropDown = ; 
</script> 

あるコードです配列を文字列エラーに変換できないことを確認します。なぜこれがここで空白になり、前述のエラーが発生しますか？

これは2012年のWindows Serverから2008年のWindows Serverに移行され、2012年に完全に正常に実行されたコードです。2008年にこのJSの呼び出しに関する既知の問題はありますか？これはAngularJSで使用されていますが、この時点でAngularJSとは独立していますので、基本的なJS/PHPです。

多くのありがとうございます。

Answer 1

json_encodeが空の文字列を返す場合は、データにASCII以外の文字が含まれている可能性があります。このように、UTF-8でそれらをエンコードしてみてください：あなたは何ができるか

<script> 
    statesDropDown = <?php echo json_encode($this->states);?>; 
    programIdsDropDown = <?php echo json_encode(array_map('utf8_encode', $this->programIdsData));?>; 
</script> 

Answer 2

は最初echojson_encodeの戻り値を避けるためです。最初にそれをphp変数に代入し、それが空の文字列かどうかを確認してから、echo '[]'