blocks|key|1259132|text|您必须确保您的日期是有效的date对象。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1259133|试试这个：|1259134|$date1=date('d/m/y');
$tempArr=explode('_',+'31_12_11');
$date2+=+date("d/m/y",+mktime(0,+0,+0,+$tempArr[1],+$tempArr[0],+$tempArr[2]));|code-block|syntax|javascript|1259135|然后，您可以执行strtotime()方法来获取差异。|offset|length|style|CODE|1259136|entityMap^0|0|0|0|8|B|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@$K|U|L|V|M|N]]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

You will have to make sure that your dates are valid date objects.

Try this:

<pre><code>$date1=date('d/m/y');
$tempArr=explode('_', '31_12_11');
$date2 = date("d/m/y", mktime(0, 0, 0, $tempArr[1], $tempArr[0], $tempArr[2]));
</code></pre>

You can then perform the <code>strtotime()</code> method to get the difference.

blocks|key|19412|text|使用DateTime::createFromFormat|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|19413|$format+=+"d_m_y";
$date1++=+\DateTime::createFromFormat($format,+"03_01_12");
$date2++=+\DateTime::createFromFormat($format,+"31_12_11");

var_dump($date1+>+$date2);|code-block|syntax|javascript|19414|entityMap|0|LINK|mutability|MUTABLE|url|http://www.php.net/manual/en/datetime.createfromformat.php^0|2|Q|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

Using <a href="http://www.php.net/manual/en/datetime.createfromformat.php" rel="noreferrer">DateTime::createFromFormat</a>:

<pre><code>$format = "d_m_y";
$date1 = \DateTime::createFromFormat($format, "03_01_12");
$date2 = \DateTime::createFromFormat($format, "31_12_11");

var_dump($date1 &gt; $date2);
</code></pre>

blocks|key|19640|text|不是回答OPs的实际问题，而是回答标题。因为这是“在php中比较日期”的最高结果。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|19641|使用Datetime对象(php+>=+5.3.0)和Compare+them+directly非常简单|offset|length|style|CODE|19642|$date1+=+new+DateTime("2009-10-11");
$date2+=+new+DateTime("tomorrow");+//+Can+use+date/string+just+like+strtotime.
var_dump($date1+<+$date2);|code-block|syntax|javascript|19643|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/datetime.diff.php#example-2749^0|0|D|C|R|L|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@$D|W|E|X|F|G]]|9|@$D|Y|E|Z|1|10]]|A|$]]|$1|H|3|I|5|J|7|11|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

Not answering the OPs actual problem, but answering just the title. Since this is the top result for "comparing dates in php".

Pretty simple to use Datetime Objects (<code>php &gt;= 5.3.0</code>) and <a href="http://php.net/manual/en/datetime.diff.php#example-2749" rel="noreferrer">Compare them directly</a>

<pre><code>$date1 = new DateTime("2009-10-11");
$date2 = new DateTime("tomorrow"); // Can use date/string just like strtotime.
var_dump($date1 &lt; $date2);
</code></pre>

blocks|key|19516|text|函数的作用是:返回两个DateTime对象之间的差值。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|19517|如果第一个日期在第二个日期之前，则返回正天数；否则返回负天数：|19518|<?php
$date1=date_create("2013-03-15");
$date2=date_create("2013-12-12");
$diff=date_diff($date1,$date2);
echo+$diff->format("%25R%25a+days");
?>|code-block|syntax|javascript|19519|输出将为"%2B272天“；|19520|更改$date1+=+"2014-03-15“|19521|+<?php
++++$date1=date_create("2014-03-15");
++++$date2=date_create("2013-12-12");
++++$diff=date_diff($date1,$date2);
++++echo+$diff->format("%25R%25a+days");
++++?>|19522|输出将是"-93天“|19523|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|V|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|W|8|@]|9|@]|A|$]]|$1|M|3|N|5|F|7|X|8|@]|9|@]|A|$G|H]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

The date_diff() function returns the difference between two DateTime objects.

If the first date is before the second date a positive number of days will be returned; otherwise a negative number of days:

<pre><code>&lt;?php
$date1=date_create("2013-03-15");
$date2=date_create("2013-12-12");
$diff=date_diff($date1,$date2);
echo $diff-&gt;format("%R%a days");
?&gt;
</code></pre>

output will be "+272 days" ;

changing 
$date1 = "2014-03-15"

<pre><code> &lt;?php
 $date1=date_create("2014-03-15");
 $date2=date_create("2013-12-12");
 $diff=date_diff($date1,$date2);
 echo $diff-&gt;format("%R%a days");
 ?&gt;
</code></pre>

Output will be "-93 days"

blocks|key|1262103|text|<?php
+++++++$expiry_date+=+"2017-12-31+00:00:00"
+++++++$today+=+date('d-m-Y',time());+
+++++++$exp+=+date('d-m-Y',strtotime($expiry_date));
+++++++$expDate+=++date_create($exp);
+++++++$todayDate+=+date_create($today);
+++++++$diff+=++date_diff($todayDate,+$expDate);
+++++++if($diff->format("%25R%25a")>0){
+++++++++++++echo+"active";
+++++++}else{
+++++++++++echo+"inactive";
+++++++}
+++++++echo+"Remaining+Days+".$diff->format("%25R%25a+days");
?>|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1262104|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>&lt;?php
 $expiry_date = "2017-12-31 00:00:00"
 $today = date('d-m-Y',time()); 
 $exp = date('d-m-Y',strtotime($expiry_date));
 $expDate = date_create($exp);
 $todayDate = date_create($today);
 $diff = date_diff($todayDate, $expDate);
 if($diff-&gt;format("%R%a")&gt;0){
 echo "active";
 }else{
 echo "inactive";
 }
 echo "Remaining Days ".$diff-&gt;format("%R%a days");
?&gt;
</code></pre>

blocks|key|19560|text|扩展@nevermind的答案，可以使用DateTime::createFromFormat:，|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|19561|//+use+-+instead+of+_.+replace+_+by+-+if+needed.
$format+=+"d-m-y";
$date1++=+DateTime::createFromFormat($format,+date('d-m-y'));
$date2++=+DateTime::createFromFormat($format,+str_replace("_",+"-",$date2));++++
var_dump($date1+>+$date2);|code-block|syntax|javascript|19562|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/datetime.createfromformat.php^0|K|R|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

Extending @nevermind's answer, one can use <a href="http://php.net/manual/en/datetime.createfromformat.php" rel="noreferrer">DateTime::createFromFormat:</a> like,

<pre><code>// use - instead of _. replace _ by - if needed.
$format = "d-m-y";
$date1 = DateTime::createFromFormat($format, date('d-m-y'));
$date2 = DateTime::createFromFormat($format, str_replace("_", "-",$date2)); 
var_dump($date1 &gt; $date2);
</code></pre>

blocks|key|4060075|text|您可以尝试执行以下操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4060076|++++++++$date1+=+date_create('2014-1-23');+//+format+of+yyyy-mm-dd
++++++++$date2+=+date_create('2014-2-3');+//+format+of+yyyy-mm-dd
++++++++$dateDiff+=+date_diff($date1,+$date2);
++++++++var_dump($dateDiff);|code-block|syntax|javascript|4060077|然后，您可以像$dateDiff->d这样访问天数的差异；|4060078|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

you can try something like:

<pre><code> $date1 = date_create('2014-1-23'); // format of yyyy-mm-dd
 $date2 = date_create('2014-2-3'); // format of yyyy-mm-dd
 $dateDiff = date_diff($date1, $date2);
 var_dump($dateDiff);
</code></pre>

You can then access the difference in days like this $dateDiff->d;

blocks|key|1259121|text|不知道你的问题是什么，但是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1259122|function+date_compare($d1,+$d2)
{
++++$d1+=+explode('_',+$d1);
++++$d2+=+explode('_',+$d2);
++++
++++$d1+=+array_reverse($d1);
++++$d2+=+array_reverse($d2);
++++
++++if+(strtotime(implode('-',+$d1))+>+strtotime(implode('-',+$d2)))
++++{
++++++++return+$d2;
++++}
++++else
++++{
++++++++return+$d1;
++++}
}|code-block|syntax|javascript|1259123|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Don't know what your problem is but:
<pre><code>function date_compare($d1, $d2)
{
 $d1 = explode('_', $d1);
 $d2 = explode('_', $d2);
 
 $d1 = array_reverse($d1);
 $d2 = array_reverse($d2);
 
 if (strtotime(implode('-', $d1)) &gt; strtotime(implode('-', $d2)))
 {
 return $d2;
 }
 else
 {
 return $d1;
 }
}
</code></pre>

blocks|key|4060257|text|尝尝这个|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4060258|$data1+=+strtotime(\date("d/m/Y"));
$data1+=+date_create($data1);
$data2+=+date_create("21/06/2017");

if($data1+<+$data2){
++++return+"The+most+current+date+is+date1";
}

return+"The+most+current+date+is+date2";|code-block|syntax|javascript|4060259|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Try this

<pre><code>$data1 = strtotime(\date("d/m/Y"));
$data1 = date_create($data1);
$data2 = date_create("21/06/2017");

if($data1 &lt; $data2){
 return "The most current date is date1";
}

return "The most current date is date2";
</code></pre>

blocks|key|1259109|text|比较每一次maketime()的结果|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1259110|entityMap^0|5|A|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

compare the result of <code>maketime()</code> for each of the time

blocks|key|1259203|text|我知道这很晚了，但为了将来参考，请使用str_replace将日期格式转换为可识别的格式，然后您的函数就可以工作了。(将下划线替换为短划线)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1259204|//change+the+format+to+dashes+instead+of+underscores,+then+get+the+timestamp
$date1+=+strtotime(str_replace("_",+"-",$date1));
$date2+=+strtotime(str_replace("_",+"-",$date2));

//compare+the+dates
if($date1+<+$date2){
+++//convert+the+date+back+to+underscore+format+if+needed+when+printing+it+out.
+++echo+'1+is+small='.$date1.','.date('d_m_y',$date1);
}else{
+++echo+'2+is+small='.$date2.','.date('d_m_y',$date2);
}|code-block|syntax|javascript|1259205|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I know this is late, but for future reference, put the date format into a recognised format by using str_replace then your function will work. (replace the underscore with a dash)

<pre><code>//change the format to dashes instead of underscores, then get the timestamp
$date1 = strtotime(str_replace("_", "-",$date1));
$date2 = strtotime(str_replace("_", "-",$date2));

//compare the dates
if($date1 &lt; $date2){
 //convert the date back to underscore format if needed when printing it out.
 echo '1 is small='.$date1.','.date('d_m_y',$date1);
}else{
 echo '2 is small='.$date2.','.date('d_m_y',$date2);
}
</code></pre>

blocks|key|1262112|text|您可以转换为整数和比较。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1262113|例如：|1262114|$date_1+=+date('Ymd');
$date_2+=+'31_12_2011';

$date_2+=+(int)+implode(array_reverse(explode("_",+$date_2)));

echo+($date_1+<+$date_2)+?+'$date_2+is+bigger+then+$date_1'+:+'$date_2+is+smaller+than+$date_1';|code-block|syntax|javascript|1262115|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

You can to converte for integer number and compare.

Eg.:

<pre><code>$date_1 = date('Ymd');
$date_2 = '31_12_2011';

$date_2 = (int) implode(array_reverse(explode("_", $date_2)));

echo ($date_1 &lt; $date_2) ? '$date_2 is bigger then $date_1' : '$date_2 is smaller than $date_1';
</code></pre>

blocks|key|4060406|text|基准比较date_create、strtotime、DateTime和direct|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4060407|直接更快|4060408|$f1="2014-12-12";
$f2="2014-12-13";
$diff=false;


$this->bench('a');
for+($i=0;+$i+<+20000;+$i%2B%2B)+{+
++++$date1=date_create($f1);
++++$date2=date_create($f2);
++++$diff=date_diff($date1,$date2);
}
$this->bench('a','b');
for+($i=0;+$i+<+20000;+$i%2B%2B)+{+
+++++$date1=strtotime($f1);
+++++$date2=strtotime($f2);
+++++if+($date1>$date2)+{
++++++++$diff=true;
++++}
}
$this->bench('b','c');
for+($i=0;+$i+<+20000;+$i%2B%2B)+{+
++++$date1+=+new+DateTime($f1);
++++$date2+=+new+DateTime($f2);
++++if+($date1>$date2)+{
++++++++$diff=true;
+++++}
}
$diff=false;
$this->bench('c','d');
for+($i=0;+$i+<+20000;+$i%2B%2B)+{+
+++++if+($f1>$f2)+{
++++++++$diff=true;
+++++}
}
$this->bench('d','e');
var_dump($diff);

$this->dumpr($this->benchs);

results:

++++[a]+=>+1610415241.4687
++++[b]+=>+1610415242.8759
++++[a-b]+=>+1.407194852829
++++[c]+=>+1610415243.5672
++++[b-c]+=>+0.69137716293335
++++[d]+=>+1610415244.7036
++++[c-d]+=>+1.1363649368286
++++[e]+=>+1610415244.7109
++++[d-e]+=>+0.0073208808898926|code-block|syntax|javascript|4060409|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

benchmark comparison
date_create, strtotime, DateTime, and direct
direct is faster
<pre><code>$f1=&quot;2014-12-12&quot;;
$f2=&quot;2014-12-13&quot;;
$diff=false;


$this-&gt;bench('a');
for ($i=0; $i &lt; 20000; $i++) { 
 $date1=date_create($f1);
 $date2=date_create($f2);
 $diff=date_diff($date1,$date2);
}
$this-&gt;bench('a','b');
for ($i=0; $i &lt; 20000; $i++) { 
 $date1=strtotime($f1);
 $date2=strtotime($f2);
 if ($date1&gt;$date2) {
 $diff=true;
 }
}
$this-&gt;bench('b','c');
for ($i=0; $i &lt; 20000; $i++) { 
 $date1 = new DateTime($f1);
 $date2 = new DateTime($f2);
 if ($date1&gt;$date2) {
 $diff=true;
 }
}
$diff=false;
$this-&gt;bench('c','d');
for ($i=0; $i &lt; 20000; $i++) { 
 if ($f1&gt;$f2) {
 $diff=true;
 }
}
$this-&gt;bench('d','e');
var_dump($diff);

$this-&gt;dumpr($this-&gt;benchs);

results:

 [a] =&gt; 1610415241.4687
 [b] =&gt; 1610415242.8759
 [a-b] =&gt; 1.407194852829
 [c] =&gt; 1610415243.5672
 [b-c] =&gt; 0.69137716293335
 [d] =&gt; 1610415244.7036
 [c-d] =&gt; 1.1363649368286
 [e] =&gt; 1610415244.7109
 [d-e] =&gt; 0.0073208808898926
</code></pre>

blocks|key|19661|text|我认为这个函数非常简单|type|unstyled|depth|inlineStyleRanges|entityRanges|data|19662|function+terminateOrNotStringtoDate($currentDate,+$terminationdate)
{
++++$crtDate+=+new+DateTime($currentDate);
++++$termDate+=+new+DateTime($terminationdate);
++++if($crtDate+>=+$termDate)
++++{
++++++++return+true;
++++}+else+{
++++return+false;
++++}
}|code-block|syntax|javascript|19663|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I think this one is very simple function

<pre><code>function terminateOrNotStringtoDate($currentDate, $terminationdate)
{
 $crtDate = new DateTime($currentDate);
 $termDate = new DateTime($terminationdate);
 if($crtDate &gt;= $termDate)
 {
 return true;
 } else {
 return false;
 }
}
</code></pre>

blocks|key|19683|text|伙计们，请不要把事情搞得这么复杂，简单的回答如下|type|unstyled|depth|inlineStyleRanges|entityRanges|data|19684|$date1=date('d_m_y');
$date2='31_12_11';
$date1=str_replace('_',+'-',+$date1);
$date2=str_replace('_',+'-',+$date2)
if(strtotime($date1)+<+strtotime($date2))
+++echo+'1+is+small+='.strtotime($date1).','.$date1;
else
+++echo+'2+is+small+='.strtotime($date2).','.$date2;|code-block|syntax|javascript|19685|我刚刚在您的代码中添加了两行|19686|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Guys Please don't make it so complex The simple answer bellow

<pre><code>$date1=date('d_m_y');
$date2='31_12_11';
$date1=str_replace('_', '-', $date1);
$date2=str_replace('_', '-', $date2)
if(strtotime($date1) &lt; strtotime($date2))
 echo '1 is small ='.strtotime($date1).','.$date1;
else
 echo '2 is small ='.strtotime($date2).','.$date2;
</code></pre>

I just have added two more lines with your code

blocks|key|19721|text|如果两个日期的格式相同，则使用比较运算符。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|19722|$date1+=+"2018-05-05";+
$date2+=+"2019-08-19";+

//comparison+operator+to++

if+($date1+>+$date2)+{
++++echo+"$date1+is+latest+than+$date2";+
++++}
else{
++++echo+"$date1+is+older+than+$date2";+
++++}|code-block|syntax|javascript|19723|输出:+2018-05-05早于2019-08-19|19724|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

If both dates are in the same format then use a comparison operator.

<pre><code>$date1 = "2018-05-05"; 
$date2 = "2019-08-19"; 

//comparison operator to 

if ($date1 &gt; $date2) {
 echo "$date1 is latest than $date2"; 
 }
else{
 echo "$date1 is older than $date2"; 
 }
</code></pre>

Output:
2018-05-05 is older than 2019-08-19

How to compare two dates in php if dates are in format <code>'03_01_12'</code> and <code>'31_12_11'</code> .

I am using this code:

<pre><code>$date1=date('d_m_y');
$date2='31_12_11';
if(strtotime($date1) &lt; strtotime($date2))
 echo '1 is small ='.strtotime($date1).','.$date1;
else
 echo '2 is small ='.strtotime($date2).','.$date2;
</code></pre>

But its not working..

How to compare two dates in php

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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如果日期是'03_01_12'和'31_12_11'格式，如何在php中比较两个日期。我使用的是以下代码：$date1=date('d_m_y');$date2='31_12_11';if(strtotime($date1) < strtotime($date2)) echo '1 is small ='.strtotime($date1).','.$date1;else echo '2

问如何在php中比较两个日期
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