echo_env.php

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<?php
 
if ( PHP_SAPI !== 'cli' ) {
    exit( 1 );
}
 
for ( $i = 1; $i < count( $argv ); $i++ ) {
    fprintf( STDOUT, "%s", getenv( $argv[$i] ) );
 
    if ( $i + 1 < count( $argv ) )
        fprintf( STDOUT, "\n" );
}