php教程

px_date2string

(PECL paradox >= 1.4.0)

px_date2string — Converts a date into a string

说明

px_date2string ( resource $pxdoc , int $value , string $format ) : string

Turns a date as it stored in the paradox file into human readable format. Paradox dates are the number of days since 1.1.0000. This function is just for convenience. It can be easily replaced by some math and the calendar functions as demonstrated in the example below.

参数

pxdoc

Resource identifier of the paradox database as returned by px_new().

value

Value as stored in paradox database field of type PX_FIELD_DATE.

format

String format similar to the format used by date(). The placeholders support by this function is a subset of those supported by date() (Y, y, m, n, d, j, L).

返回值

成功时返回 TRUE， 或者在失败时返回 FALSE。

范例

Example #1 Turn a paradox date into a human readable form

<?php
$px = px_new();

/* make up a date as it could be stored in */
/* a date field of a paradox db. */
/* 700000 days since 1.1.0000. */
$days = 700000;

/* Use the calendar functions to print a */
/* human readable format of the date */
echo jdtogregorian($days+1721425)."\n";
/* px_date2string() outputs the same */
echo px_date2string($px, $days, "n/d/Y")."\n";

px_delete($px);
?>

以上例程会输出：

7/15/1917
7/15/1917

参见

User Contributed Notes

john dot navratil at sbcglobal dot net 21-Dec-2010 09:52
Date fields are retrieved as the number of days since 0 A.D. (I think), but not as anything resembling a date.  If you are exporting this data, you must used this function to convert.  Read the schema first to determine which fields are date fields...

<?php
$schema = $pxdoc->get_schema();

$dateFields = array();
foreach ($schema as $key => $attrs) {
    if ($attrs["type"] ==  PX_FIELD_DATE)    // Collect list of "date" columns
        $dateFields[] = $key;
}
?>

An export to a CSV format, for example, could them be written...

<?php
for ($rec = 0; $rec < $totRecs; ++$rec) {
    $arr = $pxdoc->get_record($rec);

    foreach ($dateFields as $key) {
        $arr[$key] = $pxdoc->date2string($arr[$key], "m/d/Y");
    }

    fputcsv(STDOUT, $arr);  // STDOUT only available with CLI
}
?>

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