Question

我正在尝试使用str_replace。当我使用array("","")它工作并根据需要替换，但是当我使用预定义的数组时，在这种情况下从my_sql数据库获取它似乎工作。此外，str_replace适用于preg_replace_callback()

之外的预定义数组

<?
$Starting_word = array();
$Finishing_word = array();
$con = mysqli_connect("localhost","root","root","Words");
$getmodels = mysqli_query($con, "SELECT * FROM Words");
while($res = mysqli_fetch_assoc($getmodels)) {
$Starting_word[] = $res['1'];
$Finishing_word[] = $res['2'];
}
$string = '<html><h1> some hello  text i want to replace</h1><p>
some stuff i want to replace </p>';
$text_to_echo =  preg_replace_callback(
"/(<([^.]+)>)([^<]+)(<\\/\\2>)/s", 
function($matches){
    /*
     * Indexes of array:
     *    0 - full tag
     *    1 - open tag, for example <h1>
     *    2 - tag name h1
     *    3 - content
     *    4 - closing tag
     */
    //print_r($matches);
    $text = str_replace($Starting_word, $Finishing_word, $matches[3]);
    return $matches[1].$text.$matches[4];
}, 
$string
);
echo $text_to_echo;
?>

我尝试过更改为mysqli_fetch_array并且没有做任何更改。感谢。

Answer 1

除非您使用$Starting_word将$Finishing_word和use传递给回调函数，否则它们不在回调范围内

尝试

$Starting_word = array();
$Finishing_word = array();
$con = mysqli_connect("localhost","root","root","Words");
$getmodels = mysqli_query($con, "SELECT * FROM Words");
while($res = mysqli_fetch_assoc($getmodels)) {
    $Starting_word[] = $res['1'];
    $Finishing_word[] = $res['2'];
}
$string = '<html><h1> some hello  text i want to replace</h1><p>
some stuff i want to replace </p>';
$text_to_echo =  preg_replace_callback(
    "/(<([^.]+)>)([^<]+)(<\\/\\2>)/s", 
    function($matches) use ($Starting_word, $Finishing_word) {
        /*
         * Indexes of array:
         *    0 - full tag
         *    1 - open tag, for example <h1>
         *    2 - tag name h1
         *    3 - content
         *    4 - closing tag
         */
        //print_r($matches);
        $text = str_replace($Starting_word, $Finishing_word, $matches[3]);
        return $matches[1].$text.$matches[4];
    }, 
    $string
);
echo $text_to_echo;

pre__replace_callback中的str_replace无法正常工作。

1 个答案: