Question

是否有一个标志来隐藏php函数中的echo语句。我希望能够控制何时打印echo语句。这是一个示例函数，我想要一个开关来控制echo语句。

function create_liturgical_calendar($year) {
    if ( !isset($year) ) {
        $year = get_year();
    }

    global $add_data, $skip;

    echo "<div style='border-bottom: 4px solid #404040;'>year ".$year." add data ".$add_data." skip ".$skip."</div><div style='height: 92%; overflow: auto;'><br/>";

    $Baptism_of_the_Lord_date = get_Baptism_of_the_Lord($year); 
    echo 'Baptism of the Lord '.$Baptism_of_the_Lord_date->month.' '.$Baptism_of_the_Lord_date->date.' '.$Baptism_of_the_Lord_date->year.' '.$Baptism_of_the_Lord_date->date_string.'<br/>';

    $Ash_Wednesday_date = get_Ash_Wednesday_date($year);
    echo 'Ash Wednesday will be '.$Ash_Wednesday_date->month.' '.$Ash_Wednesday_date->date.' '.$Ash_Wednesday_date->year.' '.$Ash_Wednesday_date->date_string.'<br/>';

    $Annunciation_date = get_Annunciation_date($year);
    echo 'Annunciation will be '.$Annunciation_date->month.' '.$Annunciation_date->date.' '.$Annunciation_date->year.' '.$Annunciation_date->date_string.'<br/>';

    $Palm_Sunday_date = get_Palm_Sunday_date($year);
    echo 'Palm Sunday will be '.$Palm_Sunday_date->month.' '.$Palm_Sunday_date->date.' '.$Palm_Sunday_date->year.' '.$Palm_Sunday_date->date_string.'<br/>';

    $Holy_Thursday_date = get_Holy_Thursday_date($year);
    echo 'Holy Thursday will be '.$Holy_Thursday_date->month.' '.$Holy_Thursday_date->date.' '.$Holy_Thursday_date->year.' '.$Holy_Thursday_date->date_string.'<br/>';

    $Good_Friday_date = get_Good_Friday_date($year);
    echo 'Good Friday will be '.$Good_Friday_date->month.' '.$Good_Friday_date->date.' '.$Good_Friday_date->year.' '.$Good_Friday_date->date_string.'<br/>';

    $Holy_Saturday_date = get_Holy_Saturday_date($year);
    echo 'Holy Saturday will be '.$Holy_Saturday_date->month.' '.$Holy_Saturday_date->date.' '.$Holy_Saturday_date->year.' '.$Holy_Saturday_date->date_string.'<br/>';

    $Easter_date = get_Easter_date($year); 
    echo 'Easter will be '.$Easter_date->month.' '.$Easter_date->date.' '.$Easter_date->year.' '.$Easter_date->date_string.'<br/>';

    $Divine_Mercy_date = get_Divine_Mercy_date($year);
    echo 'Divine Mercy will be '.$Divine_Mercy_date->month.' '.$Divine_Mercy_date->date.' '.$Divine_Mercy_date->year.' '.$Divine_Mercy_date->date_string.'<br/>';

    $Ascension_date = get_Ascension_date($year);
    echo 'Ascension will be '.$Ascension_date->month.' '.$Ascension_date->date.' '.$Ascension_date->year.' '.$Ascension_date->date_string.'<br/>';

    $Pentecost_date = get_Pentecost_date($year);
    echo 'Pentecost will be '.$Pentecost_date->month.' '.$Pentecost_date->date.' '.$Pentecost_date->year.' '.$Pentecost_date->date_string.'<br/>';

    $Most_Holy_Trinity_date = get_Most_Holy_Trinity_date($year);
    echo 'Most Holy Trinity will be '.$Most_Holy_Trinity_date->month.' '.$Most_Holy_Trinity_date->date.' '.$Most_Holy_Trinity_date->year.' '.$Most_Holy_Trinity_date->date_string.'<br/>';

    $Corpus_Christi_date = get_Corpus_Christi_date($year);
    echo 'Corpus Christi will be '.$Corpus_Christi_date->month.' '.$Corpus_Christi_date->date.' '.$Corpus_Christi_date->year.' '.$Corpus_Christi_date->date_string.'<br/>';

    $Most_Sacred_Heart_date = get_Most_Sacred_Heart_date($year);
    echo 'Most Sacred Heart will be '.$Most_Sacred_Heart_date->month.' '.$Most_Sacred_Heart_date->date.' '.$Most_Sacred_Heart_date->year.' '.$Most_Sacred_Heart_date->date_string.'<br/>';

    $Immaculate_Heart_date = get_Immaculate_Heart_date($year);
    echo 'Immaculate Heart will be '.$Immaculate_Heart_date->month.' '.$Immaculate_Heart_date->date.' '.$Immaculate_Heart_date->year.' '.$Immaculate_Heart_date->date_string.'<br/>';

    $Christ_the_King_date = get_Christ_the_King_date($year);
    echo 'Christ the King will be '.$Christ_the_King_date->month.' '.$Christ_the_King_date->date.' '.$Christ_the_King_date->year.' '.$Christ_the_King_date->date_string.'<br/>';

}

Answer 1

停止回声的唯一方法是使用输出缓冲。 e.g。

ob_start();
echo 'Hello World';
ob_end_clean();

不产生任何输出。

此处有更多信息：http://au2.php.net/manual/en/intro.outcontrol.php

Answer 2

if ( ....your condition ) {
  echo ...
}
elseif {
  echo ...
}
else {
  echo ...
}
//etc...

or

switch ($someVar) {
  case 0:
    echo ...
  break;
  case 1:
    echo ...
  break;
  case 2:
    echo ...
  break;
}

条件是你的旗帜......如果你希望函数不回显任何东西，那么设置一个条件并使用它，但它最有意义。

function echoThings() {
  echo //etc
}

if (!$echoOff) {
  echoThings();
}

然后在需要禁用该功能时设置$echoOff = true。

Answer 3

看起来因为没有一个通用标志来切换回声，所以最好是编写一个函数。

  $print = true;

  function print_echo ( $print_text ) {
         if ( $print ) echo $print_text;
  }

  print_echo ('Print if true');

标志在php中停止回声

3 个答案: