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<?php function try_string_to_int($value): ?int { if (is_string($value) && $value === (string)(int) $value) { return (int) $value; } return null; } var_dump(try_string_to_int('foo')); var_dump(try_string_to_int('1e10')); var_dump(try_string_to_int('42')); var_dump(try_string_to_int('0')); var_dump(try_string_to_int('-500'));
Output for git.master_jit, git.master, rfc.property-hooks
NULL NULL int(42) int(0) int(-500)

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