PHP filters mobile APP expressions
<code><span>$content</span> = preg_replace_callback(<span>'/[\xf0-\xf7].{3}/'</span>, <span><span>function</span><span>(<span>$r</span>)</span> {</span><span>return</span><span>''</span>; }, <span>$content</span>);
<span>$content</span> = preg_replace(<span>'/[\xf0-\xf7].{3}/'</span>, <span>''</span>, <span>$content</span>);</code>The above introduces the expressions of PHP filtering mobile APP, including the content. I hope it will be helpful to friends who are interested in PHP tutorials.
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