PHP - String Functions
What will be the output of this PHP code?
$str = "OpenAI ChatGPT";
echo substr($str, -6, 4);
What will be the output of this PHP code?
medium📝 Predict Output Q5 of 15
Step-by-Step Solution
Solution:
Step 1: Understand negative start index
Start at -6 means counting 6 characters from the end: "ChatGPT" starts at index -7, so -6 points to 'h'.Step 2: Extract 4 characters from that position
Characters are 'h', 'a', 't', 'G' forming "hatG".Final Answer:
hatG -> Option BQuick Check:
Negative start with length extracts correct substring [OK]
Quick Trick: Negative start counts from string end backwards [OK]
Common Mistakes:
- Starting at wrong character with negative index
- Confusing length parameter
- Expecting substring to start at positive index
Master "String Functions" in PHP
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