[Solved] How can you read a file into an array of trimmed lines (no trailing newlines) using PHP? — Ans: $lines = array_map('trim', file('file.txt')); | PHP

PHP - File Handling

How can you read a file into an array of trimmed lines (no trailing newlines) using PHP?

A$lines = file('file.txt', FILE_IGNORE_NEW_LINES);

B$lines = trim(file_get_contents('file.txt'));

C$lines = array_map('trim', file('file.txt'));

D$lines = explode("\n", trim(file_get_contents('file.txt')));

Step-by-Step Solution

Solution:

Step 1: Understand file() and trimming
file() returns lines with newlines. Using array_map('trim', ...) removes whitespace including newlines from each line.
Step 2: Compare options
$lines = array_map('trim', file('file.txt')); correctly trims each line. $lines = trim(file_get_contents('file.txt')); trims whole string, not lines. $lines = file('file.txt', FILE_IGNORE_NEW_LINES); uses a flag that removes newlines but is not always available or reliable. $lines = explode("\n", trim(file_get_contents('file.txt'))); splits trimmed string but may miss last line if no newline.
Final Answer:
$lines = array_map('trim', file('file.txt')); -> Option C
Quick Check:
Trim each line with array_map('trim') [OK]

Quick Trick: Use array_map('trim', file()) to trim lines [OK]

Common Mistakes:

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