<pre class=\"ql-syntax\" spellcheck=\"false\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">function</span> <span class=\"hljs-title\">isvalidjson</span>(<span class=\"hljs-params\"><span class=\"hljs-variable\">$jsonstr</span></span>)</span>{   <span class=\"hljs-keyword\">if</span>(json_last_error()===<span class=\"hljs-number\">0</span>){     <span class=\"hljs-keyword\">return</span> <span class=\"hljs-string\">\"true\"</span>;   }   <span class=\"hljs-keyword\">else</span> {     <span class=\"hljs-keyword\">return</span> <span class=\"hljs-string\">\"false\"</span>;   } } </pre><p><br></p>