Description:
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I have a file that is building up a DB query as a string. The query is long enough that for reasons of readability, I am attempting to split it onto two lines, and concatenate the two parts of the string together into a single variable. Performing this string concatenation causes a segmentation fault. Putting both halves of the string on a single line and assigning it to the variable all at once avoids the error.

Reproduce code:
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//This causes a segmentation fault:
$qry = "SELECT h.*, oe.LevelDepth, oe.LevelName AS oeName, oe.OrgChartID";
$qry .= " FROM tblHierarchy h JOIN tblOrgElement oe ON h.OrgElementID=oe.OrgElementID WHERE levelID=2";
echo $qry;

//This runs without error:
$qry = "SELECT h.*, oe.LevelDepth, oe.LevelName AS oeName, oe.OrgChartID FROM tblHierarchy h JOIN tblOrgElement oe ON h.OrgElementID=oe.OrgElementID WHERE levelID=2";
echo $qry;

Expected result:
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I expect to see the full string output to the page.

Actual result:
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Apache does not serve the page, and my browser reports "Cannot find server". The server logs show a segmentation fault.

The code is trying to build up a DB query. However, the segmentation fault occurs on the second line building up the string. Commenting out the entire rest of the file, and only ECHOing the string to the page still generates the seg fault, where the entire file runs without error when the string is built all on one line with no concatenation.