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| rfc:trailing_whitespace_numerics [2019/02/07 01:38] – TBDs ajf | rfc:trailing_whitespace_numerics [2019/02/07 01:42] – > ajf |
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| [[rfc:invalid_strings_in_arithmetic|Since PHP 7.1]], most parts of PHP that perform string to number conversions use the same definitions of numeric strings, and differ only in the types of errors that non-well-formed and non-numeric strings produce. According to those definitions: | [[rfc:invalid_strings_in_arithmetic|Since PHP 7.1]], most parts of PHP that perform string to number conversions use the same definitions of numeric strings, and differ only in the types of errors that non-well-formed and non-numeric strings produce. According to those definitions: |
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| * A //well-formed// numeric string contains a number optionally preceded by whitespace. For example, <php>"123"</php> is well-formed (just a number), and <php" 1.23e2"</php> is also well-formed (a number preceded by whitespace). | * A //well-formed// numeric string contains a number optionally preceded by whitespace. For example, <php>"123"</php> is well-formed (just a number), and <php>" 1.23e2"</php> is also well-formed (a number preceded by whitespace). |
| * A //non-well-formed// numeric string is any string beginning with a well-formed numeric string but followed by other characters, notably including whitespace. For example, <php>"1.23e2abc"</php> is non-well-formed (a number followed by unrelated letters), and <php>" 1.23e2 "</php> (a number both preceded and followed by whitespace) is also non-well-formed. | * A //non-well-formed// numeric string is any string beginning with a well-formed numeric string but followed by other characters, notably including whitespace. For example, <php>"1.23e2abc"</php> is non-well-formed (a number followed by unrelated letters), and <php>" 1.23e2 "</php> (a number both preceded and followed by whitespace) is also non-well-formed. |
| * A //non-numeric// string is a string that is neither a well-formed nor a non-well-formed numeric string. For example, <php>"abc1.23e2"</php> is non-numeric (it doesn't start with a number, nor does it start with whitespace followed by a number). | * A //non-numeric// string is a string that is neither a well-formed nor a non-well-formed numeric string. For example, <php>"abc1.23e2"</php> is non-numeric (it doesn't start with a number, nor does it start with whitespace followed by a number). |