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Checks if a string is a valid date in the format dd/mm/yyyy.
Could easily be adapted to check for other formats or the ereg a little
less strict i.e. allow 1/8/2001. One improvement could be a second
parameter passed in with the actual date format to be checked for(e.g
if(isDate($strDate, $strDateFormat))
{
...
}
PHP functions used: ereg(), explode() and checkdate()
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<?php
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/***********************************************************************
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* function isDate
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*
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* boolean isDate(string)
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* Summary: checks if a date is formatted correctly: dd/mm/yyyy (european)
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* Author: Laurence Veale
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* Date: 30/07/2001
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***********************************************************************/
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function isDate($i_sDate)
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{
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$blnValid = TRUE;
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// check the format first (may not be necessary as we use checkdate() below)
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if(! ereg ("^[0-9]{2}/[0-9]{2}/[0-9]{4}$", $i_sDate))
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{
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$blnValid = FALSE;
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}
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else //format is okay, check that days, months, years are okay
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{
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$arrDate = explode("/", $i_sDate); // break up date by slash
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$intDay = $arrDate[0];
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$intMonth = $arrDate[1];
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$intYear = $arrDate[2];
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$intIsDate = checkdate($intMonth, $intDay, $intYear);
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if(!$intIsDate)
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{
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$blnValid = FALSE;
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}
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}//end else
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return ($blnValid);
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} //end function isDate
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?>
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