How Can You Convert Words to Integers in PHP?

Converting Words to Integers in PHP

Converting numerical values written as words into integers can be a challenging task. However, with the right approach, it is possible to effectively convert these values.

As mentioned in the provided Yahoo Answers thread, this conversion involves two key steps: tokenizing the string into numerical units and applying grammatical rules to determine the final integer value.

Tokenizing the String

The first step is to divide the input string into individual tokens that represent numerical concepts. Here's a list of possible tokens:

• POWER: thousand, million, billion
• HUNDRED: hundred
• TEN: twenty, thirty... ninety
• UNIT: one, two, three, ... nine,
• SPECIAL: ten, eleven, twelve, ... nineteen

For example, the string "two hundred and thirty thousand seven hundred and eighty three" would be tokenized as:

["two", "hundred", "and", "thirty", "thousand", "seven", "hundred", "and", "eighty", "three"]

Applying Grammatical Rules

Once the string is tokenized, the next step is to apply grammatical rules to determine the final integer value. The pseudo-code provided in the Yahoo Answers thread outlines a systematic approach for this process:

1. Start from the right side of the tokenized string.

2. Group tokens based on the following patterns:

   • SPECIAL
   • TEN
   • UNIT
   • TEN UNIT
   • UNIT HUNDRED
   • UNIT HUNDRED SPECIAL
   • UNIT HUNDRED TEN
   • UNIT HUNDRED UNIT
   • UNIT HUNDRED TEN UNIT
3. Calculate the value represented by each group and multiply by the appropriate 10s exponent (e.g., ten, hundred, thousand).
4. Sum up the values from all groups to get the final integer.

Conclusion

By tokenizing the input string and applying grammatical rules, it is possible to convert numerical values written as words into integers. While this process may initially seem complex, the outlined steps provide a systematic and effective approach for handling this conversion task.

The above is the detailed content of How Can You Convert Words to Integers in PHP?. For more information, please follow other related articles on the PHP Chinese website!