数値か時刻形式かを判断する

is_numeric();

<code><span><span><?php</span><span>$tests</span> = <span>array</span>(
    <span>"42"</span>, 
    <span>1337</span>, 
    <span>"1e4"</span>, 
    <span>"not numeric"</span>, 
    <span>array</span>(), 
    <span>9.1</span>
);

<span>foreach</span> (<span>$tests</span><span>as</span><span>$element</span>) {
    <span>if</span> (is_numeric(<span>$element</span>)) {
        <span>echo</span><span>"'{$element}' is numeric"</span>, PHP_EOL;
    } <span>else</span> {
        <span>echo</span><span>"'{$element}' is NOT numeric"</span>, PHP_EOL;
    }
}
<span>?></span></span></code>

result

<code><span>'42'</span><span>is</span> numeric
<span>'1337'</span><span>is</span> numeric
<span>'1e4'</span><span>is</span> numeric
<span>'not numeric'</span><span>is</span><span>NOT</span> numeric
<span>'Array'</span><span>is</span><span>NOT</span> numeric
<span>'9.1'</span><span>is</span> numeric</code>

strtotime($time)

<code><span>$time</span> = <span>'2015adsasd'</span>;
var_dump(strtotime(<span>$time</span>));
<span>$time1</span> = <span>'2015-01-11'</span>;
var_dump(strtotime(<span>$time1</span>));</code>

result

<code><span>bool</span>(<span>false</span>)
<span>int</span>()</code>

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以上、数値かどうかの判定と時刻形式を内容も含めて紹介しましたので、PHPチュートリアルに興味のある友人の参考になれば幸いです。