Description:
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$X="1";
$X[1e9]=0; // Allowed memory size of 536870912 bytes exhausted (tried to allocate 1000000032 bytes)

Test script:
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$X="1";
$X[1e9]=0; 

Expected result:
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i expect an error telling me that i can't assign by index if the variable is string , but instead it shows out of memory error which is very confusing error 

i encountered the error while trying to do something like this $S[Time()]=0;
thinking that $S is an empty array ( $S = [] ) while it was a string $S = "100"