<?php
$palheiro = 'canais,proteses,implantes';
$agulha = 'canais';
$pos = strpos( $palheiro, $agulha );
// exemplo de uso:
if ($pos === false) {
echo 'Não encontrado';
} else {
echo 'Encontrado';
}
echo PHP_EOL;
$encontrado = ( strpos( $palheiro, $agulha ) !== false );
if ($encontrado) {
echo 'Encontrado';
} else {
echo 'Não encontrado';
}
echo PHP_EOL;
$pos = strpos( $palheiro, $agulha ); if ( $pos !== false) echo 'encontrei!';
echo PHP_EOL;
$pos = strpos( $palheiro, $agulha ); $encontrei = ( $pos !== false ) ? 'sim' : 'não';
echo $encontrei;
echo PHP_EOL;
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