PHP TutorialsPhp What is
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Some users may be using wildly outdated, noncompliant browsers. If for some bizarre reason you're sure that a number of your site's users fall into this group, then disable the y2k_compliance parameter; otherwise, it should be enabled.
Specifies whether or not the PHP script should be made year-2000 compliant. Making the PHP script Y2K compliant (by setting this directive to On) will cause problems with non-Y2K-compliant browsers.