PHP PHP_EOL newline character

Line break
Unix series uses\n
windows series uses\r\n
mac uses\r
You can use PHP_EOL in PHP instead. To improve the source code level portability of the code

For example:

<?php
    echoPHP_EOL;
    //windows平台相当于    echo "\r\n";
    //unix\linux平台相当于    echo "\n";
    //mac平台相当于    echo "\r";
?>

Similarly commonly used ones are
DIRECTORY_SEPARATOR

can Use the function get_defined_constants() to get all PHP constants

Usage: Define constant EOL

define ('EOL',(PHP_SAPI == 'cli' ) ? PHP_EOL : 'df250b2156c434f3390392d09b1c9563');

php_sapi_name — Returns the interface type between the web server and PHP

Description

string php_sapi_name ( void )

Returns a lowercase string describing the interface type used by PHP (the Server API, SAPI). For example, under the CLI of PHP this string would be "cli", and under Apache there may be several different values, depending on the specific SAPI used. Possible values ​​are listed below.

<?php
$sapi_type = php_sapi_name();
if (substr($sapi_type, 0, 3) == &#39;cgi&#39;) {
    echo "You are using CGI PHP\n";
} else {
    echo "You are not using CGI PHP\n";
}
?>

Recommended related PHP video tutorials: 《PHP Video Tutorial》

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