php max函数从数组返回最小值

Question

this is my first post. sorry if i did something wrong...

anyways i have a file that gets updates by php and this is EXACTLY it:

31

127

131

124

144

142

133

133

9

0

22

18

i made this script in php:

$logContents = file_get_contents("logs/mainlog.txt");
$logitemArray = explode("
", $logContents);

echo max($logitemArray);

but it echos 9. why? it said in the php documentation that max() should return the biggest value in the array

thanks in advance

Answer 1

explode() returns an array of strings, so they're being compared lexicographically. You need to convert them to numbers so that max() will compare them numerically.

$logitemArray = array_map('intval', explode("
", $logContents));
echo max($logitemArray);

BTW, you can use the file() function to read a file directly into an array of lines, instead of using file_get_contents() followed by explode().

$logitemArray = array_map('intval', file("logs/mainlog.txt", FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES));