Description:
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The numbering that cal_from_jd uses for Jewish months is not explained in the documentation.

Apparently, the first six months of the Jewish year (counting from Tishri) are numbered 1 to 6; the last six months are numbered 8 to 13; and 7 appears as a month number only if the year has 13 months total. If the year is 12 months in length, then the number 7 is skipped in the month numbering.

Also, the name "AdarI" is used for Adar in all years, not just years with 13 months.



Test script:
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$n = 2456150;

for ($i=1; $i<=150; $i++) {
    $a = cal_from_jd($n, CAL_GREGORIAN);
    $b = cal_from_jd($n, CAL_JEWISH);
    echo $a['date']."  ";
    echo $b['date']."  ";
    echo $b['monthname']."\n";
    $n+=15;
}

Expected result:
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The script shows Gregorian and corresponding Jewish dates at 15-day intervals. A Jewish month is either 29 or 30 days. Therefore, the interval is too short to skip over any months.


Actual result:
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Please observe the sequence of month names and month numbers returned by the script.