自己动手制作一个模版解析

<?php

$str = ‘{if $data===1}
    1
{elseif $data===2}
    2
{else}
    3
{/if}‘;

echo $str;

$T_P=array(
    ‘#\{if(.*)\}#‘,
    ‘#\{(?:else if|elseif)(.*)\}#‘,
    ‘#\{else\}#‘,
    ‘#\{/if\}#‘,
);

$T_R=array(
    ‘<?php if (\1){ ?>‘,
    ‘<?php else if (\1) { ?>‘,
    ‘<?php else {?>‘,
    ‘<?php }?>‘,
);

echo ‘<hr>‘;

echo preg_replace($T_P, $T_R, $str);