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PHPの変数をJavaScriptに渡す方法(Laravel)

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プログラミング初心者です

同じblade上でPHPとJavaScriptを使いたい状況です
##①PHPを定義

blade.php
<?php
 $a = 'あいうえお';
?>

@php使ってもいいみたいなんですが、私は反応しませんでした
##②scriptタグの中で

blade.php
<script>
  a_js: '{{ $a }}'
 
 or

  a_js: @json($a) 
</script>

どちらかを使います
@json()は配列や連想配列の時に使うと書いてありましたが、配列じゃなくても私は使えました

*JSはまだよくわかってなくて文法間違っていたらすみません

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