Use strpos



Keywords: use strpos
Description: Notice that the position is 4, which may seem confusing at first, until you realize that PHP starts counting from 0. The number 1 - Position 0 - No match The number 2 - Position 1 - No

Notice that the position is 4, which may seem confusing at first, until you realize that PHP starts counting from 0.

  • The number 1 - Position 0 - No match
  • The number 2 - Position 1 - No match
  • The number 3 - Position 2 - No match
  • The number 4 - Position 3 - No match
  • The number 5 - Position 4 - Match

Although we only searched for a single character, you can use this function to search for a string with any number of characters. Also, it is important to note that this function will return the position of the start of the first match. So if we had searched the same string for "567890" we would again find a match and position 4 because that is where the match starts.

One of the limitations of strpos is that it only returns the position of the very first match. If there are 5,000 other matches in the string you would be none the wiser, unless you take action!

There is a third (optional) argument to strpos that will let you specify where to begin your search of the string. If you were to store the position of the last match and use that + 1 as an offset, you would skip over the first match and be find the next one.

By taking the first match's position of 4 and adding 1 we then asked strpos to begin searching after the last match. The string it was actually searching after computing the offset was: 6789012345. Letting us find the second 5 in the string.






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