How to determine whether there is a newline character in php

php method to determine whether there is a newline character: 1. Create a PHP sample file; 2. Define a string containing a newline character; 3. Use "if(strstr($string, "\n") ) {echo 'New line break found';}else {echo 'not found';}" can be used to determine whether there is a newline character.

The operating environment of this tutorial: Windows 7 system, PHP version 8.1, Dell G3 computer.

How to determine if there is a newline character in php?

The code is as follows:

$string = 'Hello
    world';

if(strstr($string, "\n")) {
    echo 'New line break found';
}
else {
    echo 'not found';
}

Or, if you want cross-operating system compatibility

The fourth line can be changed to:

if(strstr($string, PHP_EOL)) {

Also note that if the first character is \n, strpos will return 0 and your statement will evaluate to FALSE, so strstr is a better choice. Or, you can change strpos usage to:

if(strpos($string, "\n") !== FALSE) {
  echo 'New line break found';
}
else {
  echo 'not found';
}

Recommended learning: "PHP Video Tutorial"

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