php循环比较

Question

I have problems with my abc loop. I compare 2 loops, if strings are matching I embed between hyperlink but how would I would avoid to do not show the looped items twice.

<?php
    foreach($this->data->lexikon_index() as $index){
        foreach ($abc as $letter){      
            echo '<li>';
            if ( $index->alpha == $letter ){
                echo "<a href=\"#{$index->alpha}\">{$index->alpha}</a>";
            } else {
                echo $letter;
            }

            echo '</li>';
        }

        $lexikon_content[] = $this->data->lexikon_content($index->alpha);
    }
    echo '</ul>';
?>

Answer 1

Use an array to store variables that you have already used. Then use !in_array():

<?php
    unset($used);
    foreach ($this->data->lexikon_index() as $index) {
        foreach ($abc as $letter) {
            echo '<li>';
            if ($index -> alpha == $letter && !in_array($letter, $used)) {
                $used[] = $letter;
                echo "<a href=\"#{$index->alpha}\">{$index->alpha}</a>";
            } else {
                echo $letter;
            }
            echo '</li>';
        }
        $lexikon_content[] = $this -> data -> lexikon_content($index -> alpha);
    }
    echo '</ul>';
?>