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Since this function is only used in SimpleSAML_Error_Exception and a
subclass, move it here.

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Only used in the SimpleSAML_Session class, so move it there.

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- strleft
- array_values_equals
- checkAssocArrayRules

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Replace uses of utilities::selfURLhost() followed by config->getBaseURL with a call to utilities::getBaseURL().

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If UserID isn't set in $state, it means that we were unable to retrieve
it previously. Trying again isn't likely to succeed.

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By default '$' matches end of string, or newline at end of string,
which made it possible to add a trailing newline to some strings that
shouldn't have it.

As far as I can tell, none of the errors presented a security problem.

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This fixes a potential situation where another user creates the
temporary before simpleSAMLphp attempts to create it. Anther user
creating the directory could make simpleSAMLphp overwrite arbitrary
files on the system.

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