<?php
 
//if(isset($_POST["employee_id"]))  {
    //$id=$_POST["employee_id"];
    $stmt = $con->prepare("SELECT name,address,gender,designation,age FROM tbl_employee WHERE id = 119");
 
    /*Verificamos que la preparación fue correcta*/
    if ($stmt) {
        /*Si el campo id es VARCHAR cambias la "i" por una "s" en bind_param*/
        //$stmt->bind_param("i", $id);
        $stmt->execute();
        /*Aquí pasamos $stmt a nuestra función para que cree el arreglo asocitativo*/
        $arrResultado = get_result($stmt);      
    }else{
        $arrResultado=array("error"=>$stmt->error);
    }
    echo json_encode($arrResultado);
//} 
 
 
/*Esta es la función que menciono en el punto 2*/
function get_result( $Statement ) {
    $RESULT = array();
    $Statement->store_result();
    for ( $i = 0; $i < $Statement->num_rows; $i++ ) {
        $Metadata = $Statement->result_metadata();
        $PARAMS = array();
        while ( $Field = $Metadata->fetch_field() ) {
            $PARAMS[] = &$RESULT[ $i ][ $Field->name ];
        }
        call_user_func_array( array( $Statement, 'bind_result' ), $PARAMS );
        $Statement->fetch();
    }
    return $RESULT;
} 
 
 
var_dump($arrResultado);

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