Question

我已经在这个问题上苦苦挣扎了一段时间了。我无法弄清楚什么是错的。下面的代码非常简单，VISOR_URL是另一个文件中定义的常量。如果我在forearch循环外回显它会打印常量值。如果我在循环中打印它，它的值会重复。如果我使用变量，会出现同样的问题。有任何想法吗？。提前致谢。塞巴斯蒂安

<?php
require_once('conf.php');//I require the file where VISOR_URL is defined
//VISOR_URL is defined in conf.php. define('VISOR_URL', $server_ip.'/'.VISOR_NAME);

echo VISOR_URL; //echoes http://192.168.0.15/tncvisornuevo

if (!empty($occurrence_ids)) {//occurrence_ids is an array and values are printed fine

    foreach ($occurrence_ids as $key => $value) {
        echo VISOR_URL; //echoes http://192.168.0.15/tncvisornuevohttp://192.168.0.15/tncvisornuevo 

        $ocurrencia = new ca_occurrences($value);

        $nombre_ocurrencia = $ocurrencia->get('ca_occurrences.preferred_labels');

        $link = '<a href="'.VISOR_URL.'/views/occurrenceDetails.php?occurrence_id='.$value.'">'.$nombre_ocurrencia.'</a>';

        echo $link."<br>";
    }

}
?>

以下简单示例不会复制常量值：

<?php

//Define a constant
define('CONSTANT', 'imaconstant');

echo CONSTANT."<br>"; //Echoes imaconstant

$test_array = array(0,1,2,3,4,5,6,7,8);

foreach ($test_array as $key => $value) {
    echo $value.CONSTANT,"<br>"; //Echoes nimaconstant, n+1imaconstant

}

?>

Answer 1

循环将会运行多次。例如 -

$array = array('aa','bb','cc');
$var = "abc";

foreach($array as $key => $value);
{
    echo $var.'<br>';
}

/*   
   abc
   abc
   abc
*/

现在上面因为数组的大小为3，所以循环将运行3次，并回传变量... ofcourse 3次。

php常量在foreach循环中重复

1 个答案: