Question

我有3个变量垫，跟随，不是如果任何变量具有值，那么只有一个可以一次拥有我想要的值，它应该在msg中更新

这是我的逻辑

<?php     
    $mat = $this->input->post('mater_mesaage') ;
    $folow = $this->input->post('follow_message') ;
    $not = $this->input->post('not_inst_comment') ;     
    if (isset($mat)){
        echo "Mat";
        $msg = $mat  ;
    } 
    if (isset($folow )) {
        echo "folow" ;
       $msg = $folow ;
    }
    if (isset($not)){
        echo "not" ;
        $msg = $not ;
    }
    echo $msg ;
?>

Answer 1

请将==替换为=

<?php     
    $mat = $this->input->post('mater_mesaage') ;
    $folow = $this->input->post('follow_message') ;
    $not = $this->input->post('not_inst_comment') ;     
    if (isset($mat)){
        echo "Mat" ;
        $msg = $mat  ;
    } 
    if (isset($folow )) {
        echo "folow" ;
        $msg = $folow ;
    }
    if (isset($not)){
        echo "not" ;
        $msg = $not ;
    }
    echo $msg ;
?>

Answer 2

一次只有一个值，所以你应该使用elseif，所以你去了：

<?php     
    $mat = $this->input->post('mater_mesaage') ;
    $folow = $this->input->post('follow_message') ;
    $not = $this->input->post('not_inst_comment') ;     
    if (isset($mat)){
        echo "Mat";
        $msg == $mat;
    }elseif (isset($folow )) {
        echo "folow";
       $msg == $folow;
    }else{
        echo "not";
        $msg == $not;
    }
    echo $msg;
?>

Answer 3

<?php     
    $mat = $this->input->post('mater_mesaage');
    $folow = $this->input->post('follow_message');
    $not = $this->input->post('not_inst_comment');     
    if ($mat != '' || $folow != '' || $not != '') {
        $msg = ($mat != '') ? $mat : (($folow != '') ? $follow : $not);
    }
?>

如果设置了值，则在变量中获取数据

3 个答案: