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this variable will contains an error message, if check fail
name of SAPI backend
which version to compare (currently unused)
how to compare versions (currently hardcoded to 'has')
mixed - FALSE if dependency could be resolved successfully(!); or an PEAR_DEPENDENCY_* constant in case of unresolved dependency.
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PEAR_Dependency::checkProgram() | Nach oben | PEAR_Dependency::checkZend() |