在php中替换两个char（特殊符号）之间的字符串

Question

I have a string like: He *is* a good boy. How *are* you. Then I want to replace is and are with input type textbox means replace things between asterisk(*). How can I get this Please help me out.

Answer 1

<?php
    $buffer = 'He *is* a good boy. How *are* you.';
    echo "Before: $buffer<br />";
    $buffer = preg_replace_callback('/(\*(.*?)\*)/s', 'compute_replacement', $buffer);
    echo "After: $buffer<br />";

    function compute_replacement($groups) {
        // $groups[1]: *item*
        // $groups[2]: item
        return '<input type="text" value="'.$groups[2].'" />';
    }
?>

The result: