PHP - If statement within foreach

Question

So I'm brand new to PHP and am trying to accomplish something pretty simple. Import a text file to an array, have a foreach go through that array looking for a value, and printing the value if found.

Here is what I have tried so far:

$testers = file('test.txt');
foreach ($testers as $test) {echo $test . "<br />";}

This works great, each line is printed. Perfect. I then add an IF statement.

$testers = file('test.txt');
foreach ($testers as $test) {if ($test){echo $test . "<br />";}}

Also working fine, seems to be returning data. Now if I try and add an operator, it all falls apart.

$testers = file('test.txt');
foreach ($testers as $test) {if ($test == "One"){echo $test . "<br />";}}

I should say, the text file has in it numbers on each line from "One" to "Six" I also tried:

$testers = file('test.txt');
foreach ($testers as $test) {if ($test === "One"){echo $test . "<br />";}}

This also returned nothing...

Any insight would be awesome! Thanks!

What exactly am I missing here? Why is this if statement not returning the value I'm looking for?!

Answer 1

Your problem is because file() by default will include line breaks into each line. Thus, comparison on equality will fail.

You may use:

$testers = file('test.txt', FILE_IGNORE_NEW_LINES);

ie add flag so PHP won't include line breaks to resulting array items.

If you don't want to list empty lines, there's corresponding FILE_SKIP_EMPTY_LINES flag, so:

$testers = file('test.txt', FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);

Answer 2

You should use stripos() to make the check instead and do an array_filter prior to that to remove empty entries from your $testers array.

The code...

<?php
$testers = array_filter(file('test.txt'));
foreach ($testers as $test) {if (stripos($test,"One")!==false){echo $test . "<br />";}}

Answer 3

If you want to compare each line if it's equal to another, please check about strcmp

If you want to see if a line contains a string, please check strpos enter link description here

for strcmp :

foreach ($testers as $test) {if (strcmp($test,"one")==0){echo $test . "<br />";}}

for strpos:

foreach ($testers as $test) {if (strpos($test,"one") !==false){echo $test . "<br />";}}